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What is the value of \(\frac{30!}{28!}-\frac{29!}{27!}\)?

Answer and explanation

Correct answer: 58

\(\frac{30!}{28!}=30\times29\) because \(28!\) cancels. Similarly, \(\frac{29!}{27!}=29\times28\). Therefore, the difference is \(30\times29-29\times28=29(30-28)=58\). Option 56 may seem close, but it does not result from the correct common factor \(29\) and difference \(2\). Exam tip: In factorial fractions, cancel the smaller factorial first and write the remaining consecutive factors.

Related tags

Factorial NotationFactorial SimplificationPermutations And CombinationsAlgebraic SimplificationClass 11 MathematicsMathematicsClass 11 Mcq

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