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What is the value of (7! / 5! + 3!)?

Answer and explanation

Correct answer: 48

The governing concept is factorial cancellation followed by ordinary addition. Since 7! = 7 × 6 × 5!, the quotient 7!/5! simplifies to 7 × 6 = 42. Separately, 3! = 3 × 2 × 1 = 6. Therefore the value of the complete expression is 42 + 6 = 48, so option C is correct. Option B gives only the quotient and ignores the added 3!. Option A may result from an incorrect reduction or subtraction, while option D uses an incorrect value for 3! or makes an addition error. The efficient method is to cancel 5! first instead of expanding 7! into 5040; this illustrates why factorial notation is useful in calculations.

Related tags

Factorial NotationArithmetic SimplificationAdditionClass 11Factorial NotationPermutations And CombinationsMathematicsClass 11 Mcq

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