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What number replaces the question mark? 3, 5, 8,13,22, ?

+1 vote
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What number replaces the question mark? 3, 5, 8,13,22, ?
posted Mar 9, 2016 by Ahana

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3 Answers

+2 votes

3, 5, 8, 13, 22, ?

Difference between numbers :-
5 - 3 = 2
8 - 5 = 3
13 - 8 = 5
22 - 13 = 9

Procedure of calculating the difference is given below :-

2^0 + 1 = 2
2^1 + 1 = 3
2^2 + 1 = 5
2^3 + 1 = 9
2^4 + 1 = 17

Now, add 22+17 = 39

Ans :- 39

answer Mar 9, 2016 by Neha Gupta
+1 vote

Working from top to bottom, multiple by 2 to each number and subtract 1, then 2, then 3 etc.

3 x 2 - 1 = 5

5 x 2 - 2 = 8

8 x 2 - 3 = 13

13 x 2 - 4 = 22

22 x 2 - 5 = 39

answer Mar 12, 2016 by anonymous
Thanks
–2 votes

2 because 1st and 2nd sum equals 3rd......

answer Mar 9, 2016 by Ajay Kumar Topno
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