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What is the value of ( \frac{16!}{14!\cdot2!} \div \frac{15!}{13!\cdot2!} )?

Answer and explanation

Correct answer: ( \frac{8}{7} )

The direct answer is option A, \(\frac{8}{7}\). Treat the division sign carefully: the expression is the first fraction divided by the second. First, \(\frac{16!}{14!\cdot2!}=\frac{16\times15}{2}=120\), because \(16!/14!=16\times15\). Second, \(\frac{15!}{13!\cdot2!}=\frac{15 imes14}{2}=105\). Therefore the required value is \(120\div105=\frac{120}{105}=\frac{8}{7}\), after dividing by 15. Option A is correct. Option B, \(\frac{16}{15}\), can arise from cancelling incorrectly and does not equal 120 divided by 105. Option C, \(\frac{15}{14}\), is not the ratio of the two evaluated fractions. Option D, \(\frac{4}{3}\), is another incorrect cancellation. The memory cue is: simplify each fraction separately, then perform the indicated division.

Related tags

PermutationsCombinationsFactorialHard

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