The number of permutations of 'n' different objects taken 'r' at a time is given by

^{n} P_{r} = \frac{n!}{n - r!}

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^{n} P_{r} = \frac{r!}{n - r!}

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^{n} P_{r} = \frac{r - n!}{n - r!}

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^{n} P_{r} = \frac{n!}{n^{2} - r!}

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Solution

The correct option is A $^{n} P_{r} = \frac{n!}{n - r!}$
The number of permutations of 'n' object taken 'r' at a time is given by
$^{n} P_{r} = \frac{n!}{n - r!}$

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The number of permutations of n different things taking r at a time when 3 particluar things are to be included is

\frac{^{n} P_{r}}{^{n} P_{r - 2}} = (n - r + 2) (n - r + 1)

$^{n} P_{r} \div^{n} C_{r}$ =

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