Latest Infosys Aptitude Question SOLUTION: what is the 8th term in the series 1,4,9,25,35,63

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what is the 8th term in the series 1,4,9,25,35,63

Asked In Infosys mounika (10 years ago)

Solved Snehasis Read Solution (12)

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Read Solution (12) :

akash gupta  (10 years ago)

1,4,9,18,35,68 series is that
1=(2^1-1) ,4=(2^2-0), 9=(2^3+1), 18=(2^4+2) .35=(2^5+3) ,68=(2^6+4) so 8th term is 2^8+6=262

Is this solution Helpfull? Yes (42) | No (33)  

Snehasis  (10 years ago)

Answer is 78.
1, 4, 9, 25, 35, 63, 78.

Explanation:
first find the difference between each no: 4-1=3, 9-4=5, 25-9=16, 35-25=10, 63-35=28.
Now write all the differences in a series,
3, 5, 16, 10, 28
now just follow the differences series alternatively like : 3, 16, 28 and 5, 10

if u see the 3,16,28 series its gradually decreasing with some no with 13 and 12 and the next difference can be expected as 11.

and if u see the 5,10 series its gradually increasing as with 5 difference so the next no can be expected as 15.
but we need the next no to the 63 in the main given series.
So, for the next no to the 63 is 78 by following the 5,10,15 series.

therefore, 63+15=78 is the required answer.

Is this solution Helpfull? Yes (24) | No (11)  

Faizulla Khan  (10 years ago)

117 is the right answer as he asked 8th term in the series..78+39=117

Is this solution Helpfull? Yes (13) | No (2)  

nayan  (10 years ago)

this is wrong question

Is this solution Helpfull? Yes (9) | No (8)  

sai  (10 years ago)

@akash gupta: but the qus is 1,4,9,25,35,63 not 68???

Is this solution Helpfull? Yes (4) | No (2)  

akash gupta  (10 years ago)

@SAI this was the same question asked in infosys....1,4,9,18,35,68

Is this solution Helpfull? Yes (3) | No (1)  

mahendra  (10 years ago)

wrong question

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

ibmprep  (7 years ago)

Series is 1, 4, 9, 18, 35, ?,

Sol:-

2nd number: 1 x 2 + 2 = 4

3rd number: 4 x 2 + 1 = 9

4th number: 9 x 2 + 0 = 18

5th Number: 18 x 2 -1 = 35

hence the answer;

i.e. 6th Number = 35 x 2 – 2 = 68

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

minal  (8 years ago)

it should be 1,4,9,25,35,63...
then 8th term is 262

Is this solution Helpfull? Yes (2) | No   

Shivaji  (7 years ago)

The solution is from the death valley summoned by Mr. The Undertaker and approved by his Bro Kane. Hence,by virtue of Triple H and Mark henry,THE WEIGHT OF THIS QUESTION IS SIMPLY EMOTIONALLY UNBEARABLE!! COPYRIGHT CLAIM!!

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

Gourab Dutta  (10 years ago)

99
1=1^2;4=2^2;9=3^2;25=5^2;
35=6^2-1;63=8^2-1;99=10^2-1;;

Is this solution Helpfull? Yes | No (3)  

komal wavhal  (6 years ago)

Answer is 78

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