Question

if n is an odd integer shaw that n²-1 is divisible by 8​

Answer 1

If n= 3
then, 3×3-1
=8

so it is divisible by 8.

and if n=5
then,5×5-1
=24

it is divisible by 8

so we conclude that any odd no. in the form of n^2-1 is divisible by 8.

It is proved by examples.

I hope this will help you...

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