Find the next term of the series? 1,4,9,18,35,? options are a)41 b)49 c)66 d)54 solution: Formula (x*2+2,+1,+0,-1,-2) 2nd no.: 1x2+2=4 3: 4x2+1=9 4: 9x2+0=18 5: 18x2+(-1)=35 6: 35x2+(-2)=68 the 6th no. is 68 but why there is no 68 in the options ????


Infosys by SIVARAMAN SURESH on 21-Mar-2016 19:12
Find the next term of the series?

1,4,9,18,35,?

options are
a)41
b)49
c)66
d)54


solution:

Formula (
x*2+2,+1,+0,-1,-2)

2nd no.: 1x2+2=4
3: 4x2+1=9
4: 9x2+0=18
5: 18x2+(-1)=35
6: 35x2+(-2)=68

the 6th no. is 68


but why there is no 68 in the options ????

SkillRack on 21-Mar-2016 23:15
This question was asked in Infosys test. Here as your logic does not yield any one of the given options, we need to try to come up with a different logic which will yield one of the given options (As our ultimate aim is to answer the question and score marks :) ) Nth term = Previous three terms + 4 so ? = 9+18+35+4 = 66
TANMAY PRAMANICK on 22-Mar-2016 01:02
If addition is the way to solve the problem, then why the series is given in such a manner. The solution doesn't match the series given in order.
SkillRack on 22-Mar-2016 10:48
@Tanmay We cannot question the way the question is framed. We need to find the best possible solution with the given premise. The solution 66 is one of the given options. As it is previous three terms, the logic is applicable only from 4th term. If you can come up with some other logic and get any of the other options 41 or 49 or 54, then we can call the question as confusing or not proper one.
J VIGHNESH on 25-Mar-2016 22:12
2^1-1=1 2^2-0=4 2^3+1=9 2^4+2=18 2^5+3=35 so next would be 2^6+6=68
J VIGHNESH on 25-Mar-2016 22:12
sorry its,2^6+4=68
G BHARGAV on 28-Mar-2016 13:11
68
DARSHAN DAYAL SURI on 28-Mar-2016 14:50
4th digit=3rd digit+ 2nd digit + 1st digit + 4 5th digit=4th digit+ 3rd digit + 2nd digit + 4 similarly, 6th digit=5th digit + 4th digit+ 3rd digit + 4 therefore,6th digit=35+18+9+4=66 c)66, Is the correct option.
VINAYAK A MODI on 29-Mar-2016 17:34Accepted Solution
1,4,9,18,35,? so 35+31=66(can also be 68) +3,+5,+9,+17,next +31(can also be 33) +2,+4,+8 next +14(can also be 16) +2,+4,next+6(can also be 8) both 68 and 66 are possible answers as 66 is in option c)
MOHD AKRAM ANSARI on 1-Apr-2016 10:04
hello
ASHUTOSH KUMAR on 1-Apr-2016 11:12
It should be 66,by the logic of adding the last three digit.
S.JAYA KRISHNA KUMAR on 3-Apr-2016 14:15
Ans:68
HARI on 6-Apr-2016 20:04
1,4,9,18,35,? 2*1-1=1 2*2 0=4 2*2*2 1=9 2*2*2*2 2=18 2*2*2*2*2 3=35 2*2*2*2*2*2 4=68 ans=68
HARI on 6-Apr-2016 20:06
1,4,9,18,35,? 2*1-1=1 2*2 0=4 2*2*2 1=9 2*2*2*2 2=18 2*2*2*2*2 3=35 2*2*2*2*2*2 4=68 ans=68
G BHARGAV on 11-Apr-2016 12:47
66
A PRANAY DEEPU REDDY on 11-Apr-2016 16:43
Good question
Aishwarya on 12-Apr-2016 10:51
54
SAHAJ MAHESHWARI on 29-Apr-2016 04:21
ans 54 adding sequence of prime no.s
ABDUL HALEEM KHAN. S on 20-May-2016 14:40
66 is answer. (9+4+1)+4=18 (18+9+4)+4=35 (35+18+9)+4=66
DIVA on 13-Jun-2016 13:02
68
THAVAGURU M on 23-Jun-2016 12:59
66
BOOPATHI RAJA A on 27-Jun-2016 16:22
66
DUGGINENI SAI DIVYA on 28-Jun-2016 14:05
66
DUGGINENI SAI DIVYA on 28-Jun-2016 14:06
68
DILLIBABU K on 2-Jul-2016 20:33
c). 66
Solution
1,4,9,18,35,? so 35+31=66(can also be 68) +3,+5,+9,+17,next +31(can also be 33) +2,+4,+8 next +14(can also be 16) +2,+4,next+6(can also be 8) both 68 and 66 are possible answers as 66 is in option c)