Question

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

Options:
A .  8
B .  14
C .  46
D .  50
Answer: Option A

(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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