2016 AMC 8 Problems/Problem 7

Which of the following numbers is not a perfect square?

$\textbf{(A) }1^{2016}\qquad\textbf{(B) }2^{2017}\qquad\textbf{(C) }3^{2018}\qquad\textbf{(D) }4^{2019}\qquad \textbf{(E) }5^{2020}$

Solution

We know that our answer must have an odd exponent in order for it to not be a square. We can rewrite $4^2019$ as $2^4028$ , so our answer must be $\boxed{\textbf{(B) }2^{2017}}$

2016 AMC 8 (Problems • Answer Key • Resources)
Preceded by Problem 6	Followed by Problem 8
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All AJHSME/AMC 8 Problems and Solutions

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2016 AMC 8 Problems/Problem 7

Solution