Question

find out the missing number 31 16 49 169 ?

Answer 1

In this method to calculate using difference

The difference is 2,3,6,3,2.

2^2 = 2*2 = 4

4^2 = 4*4 = 16 (2 difference)

7^2 = 7*7 = 49 (3 difference)

13^2 = 13*13 = 169 (6 difference)

16^2 = 16*16 = 256 (3 difference)

18^2 = 18*18 = 324

hope this helps...