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Permutations , combinations and binomial expansion — Statistics STD 11 Commerce — Question

Gujarat BoardEnglish MediumSTD 11 CommerceStatisticsPermutations , combinations and binomial expansion1 Mark
Question
Obtain the values of : ${ }^{9} P_{9}$
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Answer

${ }^9 \mathrm{P}_9=\frac{9 !}{(9-9) !}$
$ =\frac{9 !}{0 !}$
$ =9 !$
$ =9 \times 8 \times 7 \times 6 \times 5 \times 4 \times 3 \times 2 \times 1=362880$
$ \therefore{ }^9 \mathrm{P}_9=362880$

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