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What is the value of \(\frac{8!}{6!}-\frac{5!}{4!}+2!\)?

Answer and explanation

Correct answer: 53

\(\frac{8!}{6!}=\frac{8\times7\times6!}{6!}=8\times7=56\). Also, \(\frac{5!}{4!}=5\) and \(2!=2\). Hence, \(56-5+2=53\), so option C is correct. Option 54 can result from incorrectly evaluating \(2!\) as 3. Exam tip: In a factorial fraction, expand the larger factorial up to the smaller factorial and cancel common factors.

Related tags

Factorial NotationPermutations And CombinationsClass 11 MathematicsFactorial SimplificationArithmetic EvaluationMathematicsClass 11 Mcq

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