Latest Infosys Aptitude Question SOLUTION: 3,7,13,23,41,??

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(#M40165210) INFOSYS Logical Reasoning question Number series Keep an EYE

3,7,13,23,41,??

Asked In Infosys suruthi (6 years ago)

Unsolved Read Solution (24)

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Read Solution (24) :

Devendra Marghade  (6 years ago)

75

First difference 4, 6, 10, 18, 34, ....
2nd difference 2, 4, 8, 16, 32, ....
So next number is 41+34=75

Is this solution Helpfull? Yes (22) | No (9)  

naveenKumar  (6 years ago)

2^1+1,2^2+3,2^3+5,2^4+7,2^5+9,2^6+11
2+1,4+3,8+5,16+7,32+9,64+11
3,7,13,23,41,75....
Ans is 75

Is this solution Helpfull? Yes (10) | No   

ANIL KUMAR YADAV  (6 years ago)

ans=75
3 to 7 difference=4
13 to 7 difference=6
23 to 13 differnece=10
41 to 23 difference=18

Is this solution Helpfull? Yes (5) | No (5)  

M.sharath kumar reddy  (6 years ago)

61
3&7 missing prime no.is 5 =1;
7&13 missing prime no.s 11=1;
13&23 m p n. 17,19 = 2;
23&41 m.p.n. 29,31,37=3;
41&61 m.p.n.43,47,53,59= 4

Is this solution Helpfull? Yes (2) | No (2)  

Prasad shetty  (6 years ago)

answer is 57

Is this solution Helpfull? Yes (2) | No (3)  

saranya kannedhari  (6 years ago)

3,7,13,23,41..??
answer is 75
difference between 7&3=4 | difference between 4&6=2
13&7=6 |difference between 10&6=4
23&13=10 |difference between 18&10=8
41&23=18 |so the next will be equal to 2*8=16
18+16=34(it is difference for last no's of the series)
so this differnece added to given last no of the series i.e., 34+41=75

Is this solution Helpfull? Yes (2) | No (1)  

Yaamini  (6 years ago)

Is this not a prime number series? I think 43 would be the next term.

Is this solution Helpfull? Yes (1) | No (8)  

Shekargoud S  (6 years ago)

3 7 13 23 41 ...
First difference 4, 6, 10, 18, 34, ....
2nd difference 2, 4, 8, 16, 32, ....
So next number is 41(present no)+34( two differences)=75

Is this solution Helpfull? Yes (1) | No   

sandeepkumar  (6 years ago)

75
first, we find the difference that is 4,6,10,18,34,...
and 2nd is 2,4,8,16,34
after that 41+34=75

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Sourav Majumder  (6 years ago)

75
2 stage difference

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Anand Kulkarni  (6 years ago)

3,7,13,23,41,?? 7-3=4 13-7=6, 23-13=10, 41-23=18
i.e 4,6,10,18 (Difference is increasing like 2,4,6 so next difference will be 8 )
i.e. 18+8+26 Hence Answer will be 41+26=67.

Is this solution Helpfull? Yes (1) | No (1)  

tadelu dattatreya  (5 years ago)

2*1+1=3
2*2+3=7
2*4+5=13
2*8+7=23
2*16+9=41
2*32+11=75

ans=75

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Bobbala sireesha  (6 years ago)

ans is 75,
+2 +4 +8 +16
+4 +6 +10 +18 +34
3, 7, 13, 23, 41, ??

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  (6 years ago)

75 because 41 +34 =75

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Mukesh Agrawal  (6 years ago)

59....The differnce is 4

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  (6 years ago)

3,7,13,23,41,..... => 7-3=4 , 13-7=6 i.e (4*2-2) , 23-13=10 i.e(6*2-2) , 41-23=18 i.e(10*2-2) Thus, difference of the two numbers is multiplied by 2 and then subtracted by 2. so 18*2-2=34. Hence, answer is 41+34=75

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kaviya  (6 years ago)

57
16 difference there

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KUSHAL SINGHA ROY  (5 years ago)

75.as it's happening as 2^1+1,2^2+3,2^3+5 and so on

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Ashok Reddy  (5 years ago)

3 7 13 23 41
4 6 10 18
2 4 8

next will be 16
18+16=34;
then 34+41=75

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Naveena G  (5 years ago)

3+4=7
7+6=13
13+10=23
23+18=41
41+34=75


6-4=2^1,
10-6=4=2^2,
18-10=8=2^3,
34-18=16=2^4

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Niranjan Mahesh  (5 years ago)

75 [(3*2)+1, (7*2)-1, (13*2)-3, (23*2)-5, (41*2)-5]

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vino  (5 years ago)

69 ans
difference between numbers
then .....

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Naveen  (5 years ago)

69 is answer

Is this solution Helpfull? Yes | No (1)  

V manikandan  (3 years ago)

Given:

The series: 7, 13,23,41,??

To find:

The missing term( the next number after 41)

Solution:

For finding the logic behind the series, we first check the difference between the numbers.

Here, we get to see a pattern which can be written as-

(First number*2)-1

(Second number*2)-3

(Third number*2)-5 and so on

So, each number is first multiplied by 2( constant factor) and then subtracted by a number that gets incremented by 2( 1,3,5,7,9 and so on).

So, here we get:

(7*2)-1 = 13( second number)

(13*2)-3= 23( third number)

(23*2)-5 = 41( fourth number)



So the next number( missing one) in the series would be:(41*2)-7 = 75

The missing number in the series is 75.

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