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What is the value of (6! − 5!) / 4!?

Answer and explanation

Correct answer: 25

The governing concept is factoring and cancelling factorials. Write 6! as 6 × 5!. Then the numerator becomes 6 × 5! − 5! = (6−1) × 5! = 5 × 5!. Since 5! = 5 × 4!, the entire expression is [5 × (5 × 4!)]/4! = 25. Thus option C is correct. Direct evaluation also confirms this: 6! − 5! = 720 − 120 = 600, and 600/24 = 25, but the cancellation method is shorter. Option B may come from confusing the numerator with 5!, option D from retaining 6 instead of 5 after subtraction, and option A has no valid factorial basis.

Related tags

Factorial NotationCommon FactorDivisionClass 11Factorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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