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What is the last factor in (5!)?

Answer and explanation

Correct answer: (1)

The direct answer is B, 1. By definition, \(5!=5\times4\times3\times2\times1\). The factors decrease by one each time and stop at 1; the final factor written in this product is therefore 1. Option A, 0, is wrong because zero is not included in the usual factorial product, and including it would make the product zero. Option B, 1, is correct because every positive-integer factorial ends with multiplication by 1. Option C, 2, is wrong because 2 is the second-to-last factor in \(5!\), not the last one. Option D, 5, is wrong because 5 is the first, largest factor. A factorial is not just the number itself: it is the product of all positive integers from that number down to 1. Memory cue: factorial always walks downward and finishes at 1; separately, \(0!=1\) is a special definition.

Related tags

Factorial NotationPermutations CombinationsClass 11Easy

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