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Find the value of (8! − 7!)/6!.

Answer and explanation

Correct answer: 49

Answer: 49, so option D is correct. Use the factorial rule 8!=8×7! and 7!=7×6!. First factor the numerator: 8!−7!=8×7!−7!=7!(8−1)=7×7!. Therefore (8!−7!)/6!=7×(7!/6!). Since 7!=7×6!, the remaining ratio 7!/6! equals 7. Thus the complete value is 7×7=49. Option A, 35, does not result from the correct cancellation; option B, 42, may come from using only one factor of 7; and option C, 56, incorrectly treats the subtraction or multiplication. Directly calculating 8! and 7! is unnecessary and makes errors more likely. The safe method is to extract a common factorial before dividing.

Related tags

Factorial NotationFactorial CancellationCommon FactorPermutations And CombinationsMathematicsClass 11 Mcq

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