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Numbers

Q1: Which of the following numbers will completely divide (4915 - 1) ?

A 8

B 14

C 46

D 50

ANS:A - 8

(xn - 1) will be divisibly by (x + 1) only when n is even. (4915 - 1) = {(72)15 - 1} = (730 - 1), which is divisible by (7 +1), i.e., 8.



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