Find the missing number in the following series. 2, -2, 7, 3, 17,_______,32, 13

Answer 1

List of numbers are -2 7 3 17 ? 32 13 (If ? = 25, difference numbers are underlined)

Difference of numbers = 9 -4 14 8 7 -19

The trend seems to be

7-9 = -2

3- (-4) = 7

17-14 = 3

13-(-19) = 32

The trend of the numbers is up down up down up down etc. So let's try ? = 25

Check ...... 32-7 = 25

25-8 = 17 Seems to work, So missing number (?) = 25