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What is the simplified value of ( \frac{24!}{22!}\div\frac{12!}{10!} )?

Answer and explanation

Correct answer: ( \frac{46}{11} )

The direct answer is option B, \(\frac{46}{11}\). Simplify each factorial ratio before dividing. Since \(24!=24\cdot23\cdot22!\), \(\frac{24!}{22!}=24\cdot23\). Similarly, \(12!=12\cdot11\cdot10!\), so \(\frac{12!}{10!}=12\cdot11\). Therefore the given division is \(\frac{24\cdot23}{12\cdot11}\). Cancel 24 with 12 to get \(\frac{2\cdot23}{11}=\frac{46}{11}\). Option A, \(\frac{38}{11}\), uses an incorrect numerator; option B matches the calculation. Option C, \(\frac{52}{11}\), and option D, \(\frac{58}{11}\), also do not follow from the factorial products. The key is that division by a factorial cancels all factors up to that factorial, not just one factor.

Related tags

PermutationsCombinationsFactorialExpert

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