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What is the value of (5!)/(3!) + (5!)/(4!)?

Answer and explanation

Correct answer: 25

The governing concept is cancellation of common factorial factors. Since 5! = 5 × 4 × 3!, the first quotient is 5!/3! = 5 × 4 = 20. Since 5! = 5 × 4!, the second quotient is 5!/4! = 5. Adding the two independently simplified terms gives 20 + 5 = 25. Hence option B is correct. Option A represents only the first quotient and leaves out the second term. Option C may result from an incorrect addition, and option D has no valid factorial calculation behind it. There is no need to expand 5! into 120 twice; cancelling the lower factorial is valid because factorials are non-zero, and it makes the arithmetic shorter and clearer.

Related tags

Factorial NotationFactorial CancellationAdditionClass 11Factorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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