What would be the value of n for n^2-1 divisible by 8?
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it can be 3,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,...................... All the terms in Arithmetic Progression.So it can be anyone of these . Arithmetic Progression means it has consecutive terms with same common difference . Eg:- 3,5,7 As the difference between 3 and 5 ,5 and 7 is same so there are in A.P.(Arithmetic Progression).
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