Question

2.7.28.63.126.what is thenext number.?

Answer 1

Answer:

Here, we use (n^3 + 1), (n^3 - 1), (n^3 + 1), ...

1^3 + 1 = 1 + 1 = 2,

2^3 - 1 = 8 - 1 = 7,

3^3 + 1 = 27 + 1 = 28,

4^3 - 1 = 64 - 1 = 63,

5^3 + 1 = 125 + 1 = 126,

6^3 - 1 = 216 - 1 = 215.

So, the next number is 215.