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
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
2 because 1st and 2nd sum equals 3rd......
Which number replaces the question mark - 12, 9, 7, 3, 4, 6, ??
Replace The Question Mark Below With Correct Number?
2 {38} 3 4 {1524} 5 6 {3548} 7 8 {????} 9