Power towers and exponents

Algebra Level 1

\[\large \begin{eqnarray} 2^2 &=& 4 \\ 2^{2^2} &=& 4\times 4 \\ 2^{2^{2^2}} &=& {4\times4\times4\times\cdots\times4} \end{eqnarray} \]

How many 4's are there in the last equation?

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