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What is the value of \( \frac{13!}{10!}-2\cdot\frac{12!}{10!} \)?

Answer and explanation

Correct answer: 1452

\(\frac{13!}{10!}=13\times12\times11=1716\), while \(\frac{12!}{10!}=12\times11=132\). Hence, the expression is \(1716-2\times132=1716-264=1452\). Option D is only the first term, without subtracting the second term. Exam tip: Cancel the common factorial first and then multiply the remaining consecutive factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsClass 11 MathematicsArithmetic EvaluationMathematicsClass 11 Mcq

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