What is the next number of the following sequence. 7, 8, 15, 17, 31, 35, 63, 71, ......

Sundar Kumar   10 years AGO

7, 8, 15, 17, 31, 35, 63, 71, ......

7,7+1=8,8+7=15,15+1(2)=17,17+7(2)=31,31+2(2)=35,35+14(2)=63,63+3(2)=71,71+28(2)=127

Answer: option 8) 127

Like? Yes (19) | No (11)  

Ravi Bhalani   10 years AGO

7 8 15 17 31 35 63 71 127
1 7 2 14 4 28 8 56

Like? Yes (3) | No   

Sany Brave   10 years AGO

7(+1)=8
8(+7)=15
15+(1*2)=17
17+(7*2)=31
31+(2*2)=35
35+(14*2)=63
63+(4*2)=71
SO, 71+(28*2)=127

Like? Yes (2) | No   

Vibhanshu Shukla   10 years AGO

7*2=14+1=15
8*2=16+1=17
and so on
63*2=126+1=127
option 8 is the answer....

Like? Yes (1) | No   

Arigela Naga Vineel   10 years AGO

adding 64 t it depending on the prevoius serirs numbwrs

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R. Divya   10 years AGO

First we have to determine the differences of the no like 8-7, 15-8 and so on..we get 1,7,2,14,4,28,8..if we see those difference no we get alternate no's like this.
1+1=2
2+2=4
4+4=8
And next is multiples of 7
So....If u see difference we can 7*2=14 and 7*4=28,likewise 7*8=56..if we add 56 to the last no we get 127...
71+56

Like? Yes (1) | No   

rajdeep pal   10 years AGO

7*2+1=15..
15*2+1=31..
..
63*2+1=127

Like? Yes (1) | No   

Gusto Santhosh Myth   10 years AGO

Ans:127
7,8,15,17,31,35,63,71=>

7-8=1, 8-15=7(1*7=7)
15-17=2, 17-31=14(2*7=14)
31-35=4, 35-63=28(4*7=28)
63-71=8, so next 71-127=56(8*7=56)

Like? Yes (1) | No   

Rishabh   10 years AGO

7+1=8
8+(7*1)=15
15+2=17
17+(7*2)=31
31+4=35
35+(7*4)=63
63+8=71
71+(7*8)=127
thus first number is increased by 1 and the new number formed is added by the multiple of 7 and the increment.again the number is increased by 2 and so on.

Like? Yes (1) | No   

sarvesh   10 years AGO

odd ones are increasing with 8 16 32so now it increase by 64. so ans is 127

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anusha   10 years AGO

7+(7+1)=15
8+(8+1)=17
15+(15+1)=31
17+(17+1)=35
31+(31+1)=63
35+(35+1)=71
63+(63+1)=127(ANSWER)

Like? Yes (1) | No   

Gautam Raj   10 years AGO

(7*2)+1=15
(8*2)+1=17

(15*2)+1=31
(17*2)+1=35
...
(35*2)+1=71
(63*2)+1=127

Like? Yes (1) | No   

Venkateswarlu   10 years AGO

8-7=1 7*1=7 8+7=15
17-15=2 7*2=14 17+14=31
35-34=4 7*4=28 35+28=63 so
71-63=8 7*8=56 71+56=127

Like? Yes (1) | No   

suman kumar pan   10 years AGO

7,7+(2^0)=8,8+(7)=15,15+(2^1)=17,17+(7*2=14)=31,31+(2^2)=35,35+(14*2=28)=63,63+(2^3)=71,71+(28*2=56)=127
so answer is 127.

Like? Yes (1) | No   

archana sharma   10 years AGO

because 7*2=14+1=15,15*2=30+1=31,31*2=62+1=63,63*2=126+1=127

Like? Yes (1) | No   

Lakshmi Narmada   10 years AGO

7+(2^0)=8
(2^0)*7+8=15
15+(2^1)=17
(2^1)*7+17=31
2^2+31=35
(2^2)*7+35=63
2^3+63=71
2^4*7+71=127

Like? Yes (1) | No   

abhishek mondal   10 years AGO

(7*2)+1=15;(15*2)+1=31; (31*2)+1=63 ;(63*2)+1=127...

Like? Yes (1) | No   

paul xavier   10 years AGO

7+ 1 =8 ; 8+ 7 =15
15+ 2 =17 : 17+ 14 =31
31+ 4 =35 ; 35+ 28 =63
63+ 8 =71 ; 71+ 56 =127

Like? Yes (1) | No   

Ram Neek Singh   10 years AGO

7*2+1=15
8*2+1=17
15*2+1=31
31*2+1=63
63*2+1=127

Like? Yes (1) | No   

vandana   10 years AGO

127 is the answer,
7,8,7*2+1=15,8*2+1=17,15*2+1=31,17*2+1=35,31*2+1=63,35*2+1=71,63*2+1=127.
view the series in alternate.first number*2+1=third number in the series,likewise second*2+1=fourth number in series

Like? Yes (2) | No (2)  

manisha mehta   10 years AGO

7,15,31,63...128
there are alternatively two series.we double d no. and add one to it

Like? Yes (2) | No (2)  

abhilasha   10 years AGO

multiply by 2 and add 1, with one by one number in the given series

Like? Yes (1) | No (1)  

Aarush Singh   10 years AGO

multiply by 2 and add 1, with one by one number in the given series

Like? Yes (1) | No (1)  

Anish Gureja   10 years AGO

7 + 1 = 8, 8 + 7 = 15
15 + 2 = 17, 17 + 14 = 31
31 + 4 = 35, 35 + 28 = 63
63 + 8 = 71, 71 + 56 = 127

Like? Yes (1) | No (1)  

Tark Patel   10 years AGO

7,8,15,17,31,35,63,71

7,8 difference=1 ; 15,17 difference=2 ; 31,35 difference=4 ; 63,71difference=8

and

8,15 difference=7 ; 17,31 difference=14 ; 35,63 difference=28 ;
so next difference will be 58 (7*4) so answer is 71+56 = 127.

Like? Yes (1) | No (1)  

sravani   10 years AGO

15-8=7
31-17=7*2=14
63-35=7*2*2=28
127-71=7*2*2*2=56

Like? Yes (1) | No (1)  

vishnuvardhan   10 years AGO

7+1=8
8+7=15
15+2=17
17+14=31
31+4=35
35+28=63
63+8=71
71+56=127

Like? Yes (1) | No (1)  

RANDHIR KUMAR   10 years AGO

8-7=1,15-8=7,17-15=2,31-17=14,63-35=28,71-63=8,127-71=56.

Like? Yes (1) | No (1)  

Devendra Marghade   10 years AGO

Two series,
7,15,31,63,127 & 8,17,35,71,143
(8*2+1=17),(17*2+1=35),(35*2+1=71),(71*2+1=143)
(7*2+1=15),(15*2+1=31),(31*2+1=63),(63*2+1=127)

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Bholanath    10 years AGO

odd position:
7 (7*2)+1=15 (15*2)+1=31 (31*2)+1=63 so next one will be (63*2)+1=127 Ans.

Like? Yes (1) | No (2)  

Saraswathy   10 years AGO

7 + (1) = 8
8 + (1) * 7 = 15

15 + (2) = 17
17 + (2) * 7 = 31

31 + (4) = 35
35 + (4) * 7 = 63

63 + (8) = 71
71 + (8) * 7 = 127

Ans : 127 (Option 8)

Like? Yes (2) | No (3)  

Varunraj Reddy   10 years AGO

7, 8, 15, 17, 31, 35, 63, 71, ......
Take
(7,15,31,63,x) as one group and (8,17,35,71) as another group
In first group pattern like this
7,(7*2)+1,(15*2)+1,(31*2)+1,(63*2)+1,..
Then x=(63*2)+1=127

Ans:Option 8)

Like? Yes (2) | No (3)  

Sourojit Dhua   10 years AGO

8-15=-7
17-31=-14
35-63=-28
so,
71+(7*8=56)=127

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hareesh   10 years AGO

71*2-15=127

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ESHA CHATTERJEE   10 years AGO

7*2=14
8*2=16
so next number=14+1=15
then 16+1=17
so in this way 63*2=126
so the answer is 127

Like? Yes (1) | No (2)  

Nilesh Dattatraya Veer   10 years AGO

7(+1)8(+7)15(+2)17(+14)31(+4)35(+28)63(+8)71(+56)127

Like? Yes (1) | No (2)  

dheeraj   10 years AGO

7*2+1=15,, 8*2+1=17..
15*2+1=31,,17*2+1=35..
31*2+1=63,,35*2+1=71..
63*2+1=127,,71*2+1=143

Like? Yes (2) | No (3)  

Dinesh kumar   10 years AGO

7,8,15,17,31,35,63,71.....
7+1=8
(7*1)+8=15
15+2=17
(7*2)+17=31
31+4=35
(7*4)+35=63
63+8=71
(7*8)+71=127..
Hence Ans = 127

Like? Yes (1) | No (2)  

Dr. Divya   10 years AGO

7, 8, 15, 17, 31, 35, 63, 71, ......
There are two series
7, 15 (7*2+1), 31, 63, 127(63*2+1)...
&
8, 17(8*2+1), 35, 71, ......

Like? Yes (2) | No (3)  

Debashis Dey   10 years AGO

the series consists of 2 subseries viz. 7,15,31,63 & 8,17,35,71 both with the common logic for next term as n*2+1....the next term in the series belongs to 1st subseries so it will be 63*2+1=127

Like? Yes (2) | No (3)  

Soheli Bhaduri   10 years AGO

At first take the alternate numbers.
7 15 31 63
Notice that the numbers are the(double of the previous number+1).eg:(7*2)+1=15,(15*2)+1=31,(31*2)+1=63.So,the alternate no. is (2*63)+1=127.

Like? Yes (3) | No (4)  

Kowshik Sarker   10 years AGO

odd places no. sequence is
1st place 7
3rd place 15= 7*2 + 1
5th place 31= 15*2 + 1
7th place 63=31*2 + 1
so the required no in 9th place will be
63*2 + 1=127

Like? Yes (1) | No (2)  

naveenkumar   10 years AGO

7*2=14+1=15......8*2=16+1=17. .... 15*2=30+1=31......
17*2=34+1=35......31*2=62+1=63.....35*2=70+1=71.....
63*2=126+1=127...

Like? Yes (1) | No (2)  

kapil singh   10 years AGO

63+63+1=127
as
7+8=15
15+16=31
n so on

Like? Yes (1) | No (2)  

Priyanka   10 years AGO

7+(1*1)=8
8+(7*1)=15
15+(1*2)=17
17+(7*2)=31
31+(1*2*2)=35
35+(7*2*2)=63
63+(1*2*2*2)=71
71+(7*2*2*2)=127

Like? Yes (8) | No (9)  

vinusha reddy   10 years AGO

7,15,31,63-----7,7*2+1=15,15*2+1=31,31*2+1=63,63*2+1=127

Like? Yes (1) | No (2)  

Satish Zod   10 years AGO

63 x 2 + 1 = 127

Like? Yes (1) | No (2)  

Bhupinder Singh   10 years AGO

Becoz for odd numbers 7*2+1=15 then 15*2+1=31
same as for even number 8*2+1=17, 17*2+1=35
and so on 63*2+1=127

Like? Yes (1) | No (2)  

paaredi muthyam reddy   10 years AGO

It consists to sequences alternative numbers..to get next number multiply its previous number by 2 add 1 to it.

Like? Yes (1) | No (2)  

SAHIL DIWAN   10 years AGO

15=7*2+1
17=8*2+1

....
127=63*2+1

Like? Yes (1) | No (2)  

monika garg   10 years AGO

(63*2)+1=127

Like? Yes (2) | No (3)  

ATTARU NASIMUNNI   10 years AGO

7+1 = 8
8+7 = 15
15+2 = 17
17+14 = 31
31+4 =35
35+28 = 63
63 + 8 = 71
71*56 =127

Like? Yes (1) | No (2)  

Tejas Savalia   10 years AGO

15-8 = 7 = 7*1
31-17 = 14 = 7*2
63-35 = 28 = 7*4
71 + 56 = 127

Like? Yes (1) | No (2)  

mounika kadudhuri   10 years AGO

ans: 127
there are two alternating series
7,15,31,63
8,17,35,71
in both series difference between two consecutive numbers increasing by 2 times. so 127

Like? Yes (1) | No (2)  

ABHIJEET PANDEY   10 years AGO

Ans.127
odd digit increases in multiple of 7.
while even digit increases in multiple of 2.

Like? Yes (1) | No (2)  

Sunanda Sharma   10 years AGO

difference of nos is doubled and add into next to next no

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Komala.G   10 years AGO

Option 8
Its a jumbled series
7*2+1 = 15----------8*2+1 = 17
15*2+1 = 31----------17*2+1 = 35
31*2+1 = 63----------35*2+1 = 71
63*2+1 = 127

Like? Yes (1) | No (2)  

AMIT KUMAR ANAL   10 years AGO

7*2+1=15
8*2+1=17
15*2+1=31
17*2+1=35
31*2+1=63
35*2+1=71
63*2+1=127

Like? Yes (1) | No (2)  

Abhinav Khare   10 years AGO

reason is : (7*2)+1=15
(8*2)+1=17, (15*2)+1=31......
same is (63*2)+1=127

Like? Yes (1) | No (2)  

NAVNEET RAJ VAISH   10 years AGO

7 8 15 17 31 35 63 71

difference between the 1st 2nd,3rd 4th,5th 6th,...
is a GP i.e. 1,2,4,8....

similarly difference between 2nd 3rd,4th 5th,6th 7th...
is a GP i.e, 7,14,28...

thus the difference between 8th and 9th term will 56

=> next term =71+56= 127

Like? Yes (1) | No (2)  

Rajiv Agrawal   10 years AGO

7*2+1=15
15*2+1=31
31*2+1=63
63*2+1=127

Like? Yes (1) | No (2)  

Barun Kumar   10 years AGO

7,8,15,17,31,35,63,71,...
7*2+1=15
8*2+1=17
Similarly for number after 71
it will be 63*2+1=127

Like? Yes (1) | No (2)  

Vinay Sipani    10 years AGO

Selcting the alternate numbers,
7,15,31,63,x

7*2+1=15
15*2+1=31
31*2+1=63
63*2+1=x=127

Like? Yes (1) | No (2)  

Niket saini   10 years AGO

15=7*2+1
17=8*2+1

....
127=63*2+1

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NITIN KUMAR GOYAL   10 years AGO

difference between even places are geometric series of 7. 71+56=127

Like? Yes (1) | No (2)  

Dinesh thatti   10 years AGO

the difference of above number series is as follows
8-7=1
15-8=7
17-15=2
31-17=14
35-31=4
63-35=28
71-63=8
the sequence is alternative number doubles in the difference of above series so the answer is

71+56=127

Like? Yes (1) | No (2)  

Mohammed Farook.S   10 years AGO

7+7=14+1=15 similarly 63+63=126+1=127

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kishor   10 years AGO

127

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G. SATYAVENI   10 years AGO

7*2+1=15
8*2+1=17
15*2+1=31
17*2+1=35
31*2+1=63
35*2+1=71
63*2+1=127

Like? Yes (1) | No (2)  

MADETI SANTHI SWAROOP   10 years AGO

The Difference between two alternate numbers starting from 7 till 63 is 8,16,32. So, the next answer is 63+64=127
( 15-7=8
31-15=16
63-31=32
x-63=64
x=127 )

Like? Yes (4) | No (5)  

Jigyasa Kumar   10 years AGO

multiply 2 and add 1 to the number one by one

Like? Yes (1) | No (2)  

RAKESH   10 years AGO

7+1=8 8+7=15
15+2=17 17+14=31
31+4=35 35+28=63
63+8=71 71+56=127

Like? Yes (2) | No (3)  

vimal   10 years AGO

Result is on alternative no...
7*2+1=15
15*2+1=31
31*2+1=63
so,63*2+1=127

Like? Yes (1) | No (3)  

shree   10 years AGO

ugiuiioio

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Yogesh   10 years AGO

7*2+1=15
8*2+1=17
15*2+1=31
17*2+1=35
31*2+1=63
35*2+1=71
63*2+1=127

Like? Yes (2) | No (4)  

amit baranga   10 years AGO

two series mixed together
7,15,31,63, next term=[2*(previous term)+1]
answer=[(2*63)+1]=127

Like? Yes (1) | No (3)  

Shanmugapriya   10 years AGO

7 8 15 17 31 35 63 71
1 2 4 8 Diff btwn alternate num
7 14 28 56 Diff btwn alternate num
Difference doubles..
71+56=127

Like? Yes (1) | No (3)  

RANJAN KUMAR PANDIT   10 years AGO

there are 2 series
7+8=15 15+16=31 31+32=63 63+64=127
8+9= 17 17+18=35 35+36=71

Like? Yes (2) | No (4)  

Ann Theressa   10 years AGO

Like? Yes (1) | No (3)  

Rishikesh Sharan   10 years AGO

since 8-7=1, then 15-8=7,17-15=2,31-17=14,35-31=4,63-35=28,71-63=8..
so the next no will be 71+56=127

another reason is
the difference of the alternate nos are doubling
15-7=8,31-15=16,63-31=32
so next no will be 63+64=127

Like? Yes (1) | No (3)  

kanithi.venkatesh   10 years AGO

7+1=8,7+8-0=15,15+2=17,15+17-(2-1)=31,31+4=35,31+35-(4-1)=63,63+8=71,63+71-(8-1)=127

Like? Yes (1) | No (3)