2016 AMC 8 Problems/Problem 7

Revision as of 12:35, 23 November 2016 by Nukelauncher (talk | contribs) (Solution)

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 $2^{4038}$, so our answer must be $\boxed{\textbf{(B) }2^{2017}}$

2016 AMC 8 (ProblemsAnswer KeyResources)
Preceded by
Problem 6
Followed by
Problem 8
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