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What is the value of 0!?

Answer and explanation

Correct answer: 1

The factorial of a non-negative integer n is defined as n! = n × (n − 1) × ... × 2 × 1. The special case 0! is defined to be 1. This definition is necessary for the factorial rule n! = n × (n − 1)! to remain valid when n = 1, because 1! = 1 × 0!, giving 0! = 1. It also makes the combinations formula nCr = n!/[r!(n − r)!] work correctly when r = 0 or r = n. Therefore, option C is correct. Option A confuses the factorial symbol with the number itself, option B is incorrect because 0! is explicitly defined, and option D has no mathematical basis.

Related tags

Factorial NotationPermutations And CombinationsClass 11MathematicsClass 11 Mcq

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