Question

What is the 20th number in the sequence `1, 4, 9, 16, 25, 36`?

Answer 1

`400`

Explanation:

sequence: `1,4,9,16,25,36`

`n`th term: `n^2`

`e.g. n=2, s=4`

when `n = 20`, `s = 20^2`

`= 400`