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If a number 'n' can exactly, divide (5^1...

If a number 'n' can exactly, divide `(5^14-1)` then 'n' can necessarily divide:

A

`(5^(28) - 1)`

B

`(5^(42) - 1)`

C

`(5^(21)+1)`

D

both (a) and (b)

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The correct Answer is:
D
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