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What is the value of 5!?

Answer and explanation

Correct answer: 120

The governing concept is factorial notation. For a positive integer n, n! means the product of all positive integers from n down to 1. Therefore, 5! = 5 × 4 × 3 × 2 × 1. Calculating successively gives 5 × 4 = 20, 20 × 3 = 60, 60 × 2 = 120, and 120 × 1 = 120. Hence option B is correct. The value 60 is an intermediate product obtained before multiplying by 2, while 100 and 25 do not arise from the factorial definition. Factorial notation is used in counting arrangements and combinations, so preserving every factor down to 1 is essential; omitting a factor or stopping too early produces an incorrect result.

Related tags

Factorial-NotationPermutations-CombinationsCountingClass-11Factorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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