Question

prove that n^2 - 1is not divisible by 8

Answer 1

according to the mathematical induction

Take P(n)= n^2-1 is not divisible by 8
Step 1: Put n = 1

= n^2 - 1
= 1^2 - 1
= 1 - 1
= 0
which is not divisible by 8