Latest TCS Aptitude Question SOLUTION: Inspired by fibonacci series sanket decided to create is own series which is 1,2,3,7,7,22,15,67,.... what number come immediately before 67?

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Inspired by fibonacci series sanket decided to create is own series which is 1,2,3,7,7,22,15,67,.... what number come immediately before 67?

Asked In TCS ramprasad (13 years ago)

Solved Tijo Jose Read Solution (6)

Is this Puzzle helpful?   (18)   (7) Submit Your Solution Number Series

Read Solution (6) :

Tijo Jose  (13 years ago)

the series is a combination of two series...
First one is 1, 3, 7, 15, 31, 63, ... (2^n - 1, n = 1, 2, 3, ...)
Second one is 2, 7 (= 2 + 5), 22 (= 7 + 5*3), 67 (= 22 + 5*3*3), 202 ( = 67 + 5*3*3*3), ...
Combining, we get 1, 2, 3, 7, 7, 22, 15, 67, 31, 202, 63, ...
So, if it is number before 67, then it is 15 and if it is number after 67, then it is 31, followed by 202 and so on...

Is this solution Helpfull? Yes (38) | No (5)  

Sourabh gupta  (13 years ago)

combination of 2 series ,1,3,7,15,31
Answer is 31

Is this solution Helpfull? Yes (10) | No (7)  

RAVI  (13 years ago)

the ans will be 31
2n+1

Is this solution Helpfull? Yes (6) | No (5)  

Ravi Agrawal  (13 years ago)

15. as it is asked number before 67.

Is this solution Helpfull? Yes (5) | No (16)  

srini  (7 years ago)

1,2,3,.......67=31

Is this solution Helpfull? Yes | No (1)  

kartheek  (5 years ago)

31 is the next number

Is this solution Helpfull? Yes | No   

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