What is the next number of the following sequence. .5, 2, 6.5, 20, .....

Dr.Dipin Singh   10 years AGO

0.5+1.5*1=2
2+1.5*3= 6.5
6.5+1.5*3*3=20
20+1.5*3*3*3 = 60.5 ... option 5

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venkatesh.p   10 years AGO

0.5,2,6.5,20,......

0.5x3 + 0.5 = 2 2x3 +0.5 = 6.5 6.5x3 +0.5 = 20 20x30+0.5 = 60.5

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K.ARun   10 years AGO

Difference of 2nd and 1st no and multiply it by 3 and add them with the current no.
0.5 ------> (0.5-0)*3 + 0.5 -------> 2
2 -----> (2-0.5)*3 + 2--------> 6.5
6.5 ------>(6.5-2)*3 + 6.5------> 20
20 ------->(20-6.5)*3 + 20 -----> 60.5

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Santosh Kumar Behera   10 years AGO

.5*3=1.5+.5=2
2*3=6+.5=6.5
6.5*3=19.5+.5=20
so 20*3=60+.5=60.5

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Vinay Sipani    10 years AGO

0.5 * 3 + 0.5 = 2
2 * 3 + 0.5 = 6.5
6.5 * 3 + 0.5 = 20

=> next term = 20 * 3 + 0.5 = 60.5

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Jaspalsingh Parmar   10 years AGO

2-0.5=1.5
6.5-2=4.5
20-6.5=13.5

As we see answer is multiple of 3 to the previous answer
so
13.5*3=40.5

20+40.5=60.5
So the option 5 is correct

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Supriya Mondal   10 years AGO

Difference between 1st and 2nd number is=1.5
and difference between 2nd and 3rd number is=4.5 which is 3 times of the difference between 1st and 2nd number.
Like that difference between 3rd and 4th number is=13.5 which is 3 times of the difference between 2nd and 3rd number.
like that, difference between 4th and 5th number is=(13.5*3)=40.5
So, next number is (20+40.5)=60.5
So option 5)60.5 will be the correct answer

Like? Yes (2) | No (1)  

Devendra Marghade   10 years AGO

0.5+ 0.5*3= 0.5+1.5 =2
2+ 1.5*3= 2+ 4.5= 6.5
6.5+4.5*3= 6.5+ 13.5=20
20+13.5*3= 20+ 40.5=60.5

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ITHA Naresh Babu   10 years AGO

1/2,4/2,13/2,40/2.........
diffrence in numerators is 3,9,27,81.........
so next number will be (40+81)/2=121/2=60.5

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Tania Chatterjee   10 years AGO

.5 + (3^1)*.5 =2
2+(3^2)*.5=6.5
hence 20+((3^4)*.5=60.5

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Surit Datta   10 years AGO

The difference between 2 and .5 is 1.5
difference between 6.5 and 2 is 4.5
which is thrice of the first difference
similarly difference between 20 and 6.5 is 13.5
which is thrice of the second difference
continuing this way the next difference will be
13.5*3 = 40.5
so the next number will be
20+40.5
which is 60.5
That's it..
Option 5

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llamar   10 years AGO

0.5*3=1.5+0.5=2
2*3=6+0.5=6.5
6.5*3=19.5+0.5=20
20*3=60+0.5=60.5

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P.ARUNA   10 years AGO

0.5+(0.5)*3=2
2+(0.5)*9=6.5
6.5+(0.5)*27=20
20+(0.5)*81=60.5

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MRITUNJAY   10 years AGO

multiply by 3 and add 0.5
20*3+0.5=60.5

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tirupathi reddy   10 years AGO

0.5, 2, 6.5, 20, .....
0.5 + 1.5. = 2
2 + 1.5*3 = 6.5
6.5 + 4.5*3 = 20
20 + 13.5*3 = 60.5

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sravani   10 years AGO

diff 0.5,2=1.5
diff 2,6.5=4.5=1.5*3
diff 6.5,20=13.5=1.5*9
next 20,60.5=40.5=1.5*27

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SREENIVASA RAO PALLAPU   10 years AGO

2-0.5 =1.5
6.5 - 2 = 4.5 (i.e 1.5 x 3)
20 - 6.5 = 13.5 (i.e 4.5 x 3)
next number = 20 + (13.5 x 3) = 60.5

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vikram   10 years AGO

0.5*2=1+1=2
2*2=4+2.5=6.5
6.5*2=13+7=20
20*2=40+20.5=60.5

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MURUGESAN.P   10 years AGO

2-.5=1.5
6.5-2=4.5
20-6.5=13.5
4.5-1.5=3(3^1)
13.5-4.5=9(3^2)
next difference will be 27(3^3)
so the series is
.5,2,(3+1.5+2),(9+4.5+6.5),(27+13.5+20)
this equal to .5,2,6.5,20,60.5
so the ans is 60.5

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khushboo goenka   10 years AGO

add 1.5 thn 4.5 thn 13.5 thn 40.5

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Ajinkya Kulkarni   10 years AGO

60.5

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sanjeev kumar   10 years AGO

Ans 5

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PAWAN KUMAR   10 years AGO

(0.5-0)*3 + 0.5 = 2
(2-0.5)*3 + 2.0 = 6.5
(6.5-2)*3 + 6.5 = 20
(20-6.5)*3 + 20 = 40.5 + 20 = 60.5. Ans.

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nikhil   10 years AGO

1)0.5*1=0.5
2)0.5*1+0.5*3+0.5*9+0.5*27+0.5*81=60.5

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K.NagaSugunaManasa   10 years AGO

.5,2,6.5,20
2-0.5=1.5 6.5-2=4.5 , 20-6.5=13.5;
4.5-1.5=3, 13.5-4.5=9,so next is 27(3*3*3)
s0 27+13.5=40.5
so add 40.5 to 20
40.5+20=60.5
option is 5

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Ankit Pandey   10 years AGO

0.5*4=2
2*3+2/4=6.5
6*3+0.5*4=20
20*3+20/40=60.5

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Md.Sultan Khichi   10 years AGO

.5*3+.5=2
2*3+.5=6.5
6.5*3+.5=20
20*3+.5=60.5
Ans. 60.5

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shovan Manna   10 years AGO

the sequence is like *3+.5 with previous term to get the net term

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lavanya   10 years AGO

0.5=1/2
2=4/2
6.5=13/2,
20=40/2,
and the difference between numerators is 3,9,27,81...
ans is 121/2=60.5

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shree   10 years AGO

(.5*3+0.5), (2*3+0.5), (6.5*3+0.5), (20*3+0.5=60.5)
=> 60.5 is ans

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MRITUNJAY KUMAR   10 years AGO

Option)5

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SHANMUGAPRIIYAN   10 years AGO

0.5+(3*05)=2
2+(3 pow 2*0.5)=6.5 3 pow 2=9
6.5+(3 pow 3*0.5)=20 3 pow 3=27
therefore, 20+(3 pow 4*0.5)=60.5 3 pow 4=81
ANSWER 60.5

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ABHINAV PUSHPAM   10 years AGO

*3+.5 in each no.

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Rats   10 years AGO

(.5*3)+.5=2
(2*3)+.5=6.5
(6.5*3)+.5=20
(20*3)+.5=60.5

Like? Yes (1) | No (1)