Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
EasyIf $^n{P_5} = 9 \times {^{n - 1}}{P_4}$,then the value of $n$ is
- A$6$
- B$8$
- C$5$
- D$9$
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