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If \(M\) and \(x\) are positive integers greater than \(1,\) what is the unit digit of \(M^x?\)

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If \(M\) and \(x\) are positive integers greater than \(1,\) what is the unit digit of \(M^x?\)

by M7MBA » Sun Dec 27, 2020 3:27 pm

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If \(M\) and \(x\) are positive integers greater than \(1,\) what is the unit digit of \(M^x?\)

(1) \(M\) when divided by \(5\) gives a remainder of \(1.\)
(2) \(M=21\)

Answer: B

Source: e-GMAT
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