Question

if n is an odd positive integer then show that n square minus 1 is divisible by 8​

Answer 1

Let n = 3

so

3.3 = 9

a.t.q

9-1 = 8

8 is divisible by 8

Let n= 5

5×5-1 = 24

24 is also divisible by 8

so from above the condition is clear