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What is the value of (\frac{12!}{10!\cdot2})?

Answer and explanation

Correct answer: (66)

The direct answer is option C, 66. Expand only the part of 12! that is not contained in 10!: \(12!=12\times11 imes10!\). Thus, \(\frac{12!}{10! imes2}=\frac{12 imes11 imes10!}{10! imes2}=\frac{12 imes11}{2}=6 imes11=66\). Option A, 54, is wrong because it does not result from the correct remaining factors. Option B, 60, may come from using 10 instead of 11 or making an arithmetic error. Option C, 66, is correct. Option D, 72, is the product 12 × 6 and does not represent division by 2 after the correct cancellation. The key is that the denominator contains both 10! and 2; cancel 10! first, not the numbers 10 or 12 separately. Memory cue: write factorials as products before cancelling.

Related tags

Factorial NotationSimplificationClass 11

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