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What is the simplified value of \( \frac{16!}{12!\cdot4!} \)?

Answer and explanation

Correct answer: 1820

Write \(16! = 16\cdot15\cdot14\cdot13\cdot12!\), so \(12!\) cancels. Hence, \(\frac{16!}{12!\cdot4!}=\frac{16\cdot15\cdot14\cdot13}{4\cdot3\cdot2\cdot1}=1820\). Therefore, option B is correct. This expression is \(\binom{16}{4}\); 1365 is the value of \(\binom{15}{4}\), not of the given expression. Exam tip: In factorial fractions, cancel common factorial terms before carrying out the remaining multiplication.

Related tags

Factorial NotationBinomial CoefficientPermutations And CombinationsCombinatoricsClass 11 MathematicsMathematicsClass 11 Mcq

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