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What is the value of (10!)/(8!) + (4!)/(2!)?

Answer and explanation

Correct answer: 102

Use the factorial identity n! = n(n−1)! and cancel the common lower factorial in each quotient. Because 10! = 10 × 9 × 8!, we get 10!/8! = 10 × 9 = 90. Similarly, 4! = 4 × 3 × 2!, so 4!/2! = 4 × 3 = 12. The complete expression is therefore 90 + 12 = 102, making option C correct. Option A is only the first quotient and omits the second one. Option B reflects an incorrect value or addition for the second quotient, while option D is larger than the valid sum. Expanding 10! and 4! completely is unnecessary; cancellation preserves the value and greatly reduces the chance of arithmetic errors.

Related tags

Factorial NotationFactorial CancellationAdditionClass 11Factorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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