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What is the value of (\frac{6!}{2!,4!}+\frac{5!}{2!,3!})?

Answer and explanation

Correct answer: (25)

The direct answer is option B, 25. Factorials can be cancelled in combinations of this form. First, \(\frac{6!}{2!4!}=\frac{6\times5\times4!}{2!\times4!}=\frac{6\times5}{2}=15\), since \(4!\) cancels and \(2!=2\). Next, \(\frac{5!}{2!3!}=\frac{5\times4\times3!}{2!\times3!}=\frac{5\times4}{2}=10\). Adding the two separately calculated values gives \(15+10=25\). Option A, 20, is wrong because it does not give the correct sum. Option B, 25, is correct. Option C, 30, may result from an arithmetic or factorial-cancellation error. Option D, 35, is also inconsistent with the two correct terms. Do not combine the fractions incorrectly; simplify each fraction first and add only at the end. Memory cue: cancel common factorial parts before ordinary multiplication and addition.

Related tags

Factorial NotationPermutations CombinationsClass 11Medium

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