Question

How many non-square number are there between 18^2 and 20^2

Answer 1

18^2=324
20^2=400
if the nos are whole no.
than there are one square no between them I.e.361
so no of non square no =400-323=77

Answer 2

18²= 324
20²=400

2n = 2 * 18 = 36