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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.
$\therefore n =4, r =4$
$\therefore$ 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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