If \( a_{1}=1 \) and \( a_{n}=n a_{n-1} \) for all positive integer...

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If \( a_{1}=1 \) and \( a_{n}=n a_{n-1} \) for all positive integer \( \mathrm{n} \geq 2 \), then \( a_{5} \) is equal to
\( \mathrm{P} \)
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