$\left(-\dfrac{2}{3}\right)^{4}$ equals

$\left(-\dfrac{2}{3}\right)^{4}$ equals
  1. $\dfrac{16}{81}$
  2. $-\dfrac{16}{81}$
  3. $\dfrac{8}{27}$
  4. $\dfrac{16}{27}$

Solution

Even power $\Rightarrow$ positive: $\dfrac{16}{81}$.

Asked in: IMO

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