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If nP0 is asked, what is its value?

Answer and explanation

Correct answer: 1

The standard permutation identity is nP0=1. From the formula nPr=n!/(n-r)!, putting r=0 gives nP0=n!/(n-0)!=n!/n!=1, provided n is a nonnegative integer. The combinatorial meaning agrees: selecting and arranging zero objects from n objects can be done in exactly one way, namely selecting nothing and leaving the arrangement empty. Therefore option A is correct. It is not 0, because there is one valid empty selection, and it is not n because no object is being selected. Although n!/n! also simplifies to 1, the requested numerical value is represented directly by option A.

Related tags

PermutationsStandard IdentitiesFactorialsPermutations And CombinationsMathematicsClass 11 Mcq

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