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What is the value of (5! × 3!) / 4!?

Answer and explanation

Correct answer: 30

The governing concept is factorial notation and cancellation. For a positive integer n, n! is the product of all positive integers from n down to 1. Since 5! = 5 × 4!, the fraction 5!/4! simplifies directly to 5. Therefore, (5! × 3!)/4! = 5 × 3!. Now calculate 3! = 3 × 2 × 1 = 6, giving 5 × 6 = 30. Hence option B is correct. A direct check also confirms the result: 5! = 120, 3! = 6, and 4! = 24, so 120 × 6 ÷ 24 = 30. The factorial symbols must be evaluated as products, not treated as ordinary multiplication signs or cancelled without preserving their factors.

Related tags

Factorial NotationFactorial CancellationClass 11 MathematicsPermutations And CombinationsMathematicsClass 11 Mcq

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