Question

What must be in place of the question mark in the following series ?

3, 14, 39, 84, 155, ?

Answer 1

1 x 1 x 1 + 1 x 1 + 1 = 1 + 1 + 1 = 3

2 x 2 x 2 + 2 x 2 + 2 = 8 + 4 + 2 = 14

3 x 3 x 3 + 3 x 3 + 3 = 27 + 9 + 3 = 39

4 x 4 x 4 + 4 x 4+ 4 = 64 + 16 + 4 = 84

5 x 5 x 5 + 5 x 5 + 5 = 125 + 25 + 5 = 155
Answer is 258
6 x 6 x 6 + 6 x 6 + 6 = 216 + 36 + 6 = 258