Which of the following numbers will completely divide (4915 - 1) ?
8
14
46
50
Explanation:
$x$ n - 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.