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By how much is \( \frac{9!}{7!} \) greater than \( \frac{8!}{6!} \)?

Answer and explanation

Correct answer: 16

\(\frac{9!}{7!}=9\times8=72\) because \(7!\) cancels out. Similarly, \(\frac{8!}{6!}=8\times7=56\). Therefore, the required difference is \(72-56=16\). Option 20 can result from an error in multiplication or subtraction. Exam tip: In a factorial fraction, cancel the common smaller factorial first and multiply only the remaining consecutive numbers.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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