(C) The formula for permutation is given by $^{n}P_r = \frac{n!}{(n-r)!}$.Given $^{12}P_r = 1320$.We know that $^{12}P_r = 12 \times 11 \times 10 \tim

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(C) The formula for permutation is given by $^{n}P_r = \frac{n!}{(n-r)!}$.Given $^{12}P_r = 1320$.We know that $^{12}P_r = 12 \times 11 \times 10 \times \dots \times (12-r+1)$.Calculating the product:$12 \times 11 = 132$$132 \times 10 = 1320$Since the product of $3$ terms is $1320$,we have $r = 3$.

Class 11 Mathematics Permutation and Combination Definition of permutation, Number of permutations with or without repetition, Conditional permutations

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If $^{12}P_r = 1320$,then $r$ is equal to

A
$5$
B
$4$
C
$3$
D
$2$

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Class 11

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Permutation and Combination

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Definition of permutation, Number of permutations with or without repetition, Conditional permutations

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If $^{12}P_r = 1320$,then $r$ is equal to

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