Evaluate \( \frac{n !}{(n-r) !} \), when \( \mathrm{P} \) (i) \( n=...

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Evaluate \( \frac{n !}{(n-r) !} \), when
\( \mathrm{P} \)
(i) \( n=6, r=2 \)
(ii) \( n=9, r=5 \).
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