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Quantitative Aptitude

Divisibility Rule for 7 & 13

Show that n3-...

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Show that n3-n is divisible by 8 if n is an odd positive integer

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n^{3} + 2 n^{2} - 5 n - 6,

where n is any positive integer, is always divisible by

Q. If m is an odd positive integer, then show that

m^{2} - 1

is divisible by

8

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