Question

Check the odd one 6,12,20,30,42,54,72,90,110

Answer 1

6=6
12=1+2=3
20=2+0=2
30=3+0=3
42=4+2=6

Answer 2

Insert the missing number.

2, 6, 12, 20, 30, 42, 56, (....)

A) 61B) 64C) 72D) 70

Answer:   C) 72 

Explanation:

The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8.

So, the next number is 8 x 9 = 72.