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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
In how many ways can $4$ persons be arranged in a row ?
✓

Answer

4 persons are to be arranged in a row.
$\therefore n=4, r=4$
$ \therefore \text { Total permutations }={ }^4 P_4$
$ =4 !\left(\because{ }^n P_n=n !\right)$
$ =4 \times 3 \times 2 \times 1$
$ =24$

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