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What is the value of (7! − 6!)/(6!)?

Answer and explanation

Correct answer: 6

The key idea is to express the larger factorial using the smaller factorial and then factor. Since 7! = 7 × 6!, the numerator becomes 7 × 6! − 6! = (7−1) × 6! = 6 × 6!. Dividing by 6! gives (6 × 6!)/6! = 6, because 6! is non-zero. Thus option B is correct. An equivalent method is to divide each term in the numerator by 6!: 7!/6! − 6!/6! = 7 − 1 = 6. Option C results from forgetting the subtraction of 6!, while option A uses an incorrect subtraction and option D has no valid factorial basis. Factorising before division makes the structure transparent.

Related tags

Factorial NotationFactorial CancellationAlgebraic SimplificationClass 11Factorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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