Question

How many natural numbers lie between 40² and 41²?​

Answer 1

Answer:

There is formula for finding the number of non square numbers. Number of non square between n² and (n+1)² = 2n. so, there are 2n = 2×40 = 80 non square number between 40² and 41². Hence, there are 80 non square numbers between 40² and 41²