Question

If n is an odd integer then show that n2 - 1 is divisible by 8.
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Answer 1

I assume n be 4.5

let n be 4.5

so

we can write this as 45/10

now {(2*45)/10}-1

now 90/10=9-1=8

so 8 is divisible by8

the answer will be 1

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