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What is the value of 7! − 6!?

Answer and explanation

Correct answer: 4320

Use the factorial recurrence 7! = 7 × 6! and factor out the common quantity 6!. The expression becomes 7! − 6! = 7 × 6! − 6! = (7 − 1)6! = 6 × 6!. Since 6! = 6 × 5 × 4 × 3 × 2 × 1 = 720, the result is 6 × 720 = 4320. Therefore, option A is correct. A direct check also gives 7! = 5040 and 5040 − 720 = 4320. Option B is just 7!, while option C is just 6!, so neither is the requested difference. Option D results from an arithmetic or factoring error. Extracting the common factorial is the most efficient method.

Related tags

Factorial NotationFactorial IdentitiesAlgebraic SimplificationClass 11MathematicsPermutations And CombinationsClass 11 Mcq

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