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If \(x\) and \(y\) are positive integers and \(n = 5^x + 7^{y + 3},\) what is the units digit of \(n?\)

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If \(x\) and \(y\) are positive integers and \(n = 5^x + 7^{y + 3},\) what is the units digit of \(n?\)

by VJesus12 » Tue Sep 22, 2020 7:14 am

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If \(x\) and \(y\) are positive integers and \(n = 5^x + 7^{y + 3},\) what is the units digit of \(n?\)

(1) \(y = 2x - 16\)
(2) \(y\) is divisible by \(4.\)

Answer: B

Source: Manhattan GMAT
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