What is the next number in the series
1 , 2 , 4 , 13 , 31 , 112 , ?
-- James.
This is a discussion on Next number in the series... within the Brainteasers forums, part of the Brain Quiz category; What is the next number in the series 1 , 2 , 4 , 13 , 31 , 112 , ? -- James....
What is the next number in the series
1 , 2 , 4 , 13 , 31 , 112 , ?
-- James.
My guess about the next number appearing in the sequence is 225. Am I right?
No Stephen...225 is not the right answer.
I'll give you a clue...look the first three numbers carefully
-- James
Is the next number in the series is 211.If I am wrong kindly correct me to get the right answer.
NO. 211 is a wrong answer.
No your answer is wrong.
I think the answer is 213.....
Is it correct..?
HI All,
Th answer is 729.
The logic is of two steps :-
1) First of all subtract the first number from second, second from third, third from fourth and so on. You will be left with 1, 2, 9, 18, 81....
2) The last step is divide second number by first, third by second and so on. You will automatically find the next number.
James, please confirm.
Thanks,
Nikhar
Even I got the answer as 729.Hope our answer is correct.James have to confirm this.
729 is not the right answer. You guys have put great effort to solve this problem. So I really want some one to say 'eureka'. I am giving u a clue... look at the digits in the series none of them is more than 4
Hi All,
Finally i got the answer......
The next number in the series is 224.
Explanation....
The Given Series is 1,2,4,13,31,112,...
Actually the series is 1,2,4,8,16,32,....
James convert these numbers into the base 5.
it means ......
5 | 8
----
1 - 3
5 | 16
-----
3 - 1
5 | 32
-----
5 | 6 - 2
----
1 - 1
5 | 64
----
5 | 12 - 4
----
2 - 2
So this series going like.. 1, 2, 4, 13, 31, 112, 224, 1003,.....
-suresh
Last edited by psuresh1982; 11-14-2006 at 01:21 AM.
Great Job Suresh!!