Question

31, 29, 24, 22, 17, ... What number should come next?
A.15
B.14
C.13
D.12

Answer 1

A.15

31-29=2
29-24=5
24-22=2
22-17=5
Each number differ by 2 and 5
So the nxt number must be 15 so that we will get difference 2
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Answer 2

Step-by-step explanation:

A. 15

=======================

31, 29, 24, 22, 17, .....

Here, in the series "31, 29, 24, 22, 17, .....", number is decreasing, first by 2 and then by 5.

See there,

31 - 2 = 29

29 - 5 = 24

24 - 2 = 22

22 - 5 = 17

So, the number which should come next = 17 - 2

= 15.

After that, the next number would be:-

15 - 5 = 10

10 - 2 = 8

8 - 5 = 3

3 - 2 = 1

31, 29, 24, 22, 17, 15, 10, 8, 3, 1, ..........