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What is the value of (4! - 3!)?

Answer and explanation

Correct answer: 18

The governing concept is factorial notation. For a positive integer n, n! means the product n × (n − 1) × ... × 2 × 1. The factorial signs in this expression apply separately to 4 and 3, so calculate each one before subtracting. We get 4! = 4 × 3 × 2 × 1 = 24 and 3! = 3 × 2 × 1 = 6. Therefore, 4! − 3! = 24 − 6 = 18, so option A is correct. The subtraction is not included inside either factorial. Treating the exclamation mark as an ordinary multiplication symbol or applying one factorial to the entire difference would produce an invalid method. The other options do not equal the calculated difference.

Related tags

Factorial NotationPermutations And CombinationsClass 11 MathematicsMathematicsClass 11 Mcq

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