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What is the value of (7!)/(5!) − (6!)/(4!)?

Answer and explanation

Correct answer: 12

Apply factorial cancellation before subtracting. Since 7! = 7 × 6 × 5!, the first quotient is 7!/5! = 7 × 6 = 42. Similarly, 6! = 6 × 5 × 4!, so 6!/4! = 6 × 5 = 30. The required value is therefore 42 − 30 = 12, making option A correct. Option D is only the second quotient and ignores the subtraction. Option C may come from an incorrect subtraction, while option B has no valid result from the two simplified terms. The expression 7!/5! must not be read as 7/5; all consecutive factors between the numerator and denominator factorials remain after cancellation. The same principle applies to the second quotient.

Related tags

Factorial NotationFactorial CancellationSubtractionClass 11MathematicsPermutations And CombinationsClass 11 Mcq

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