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If (x=4!), what is the value of (x)?

Answer and explanation

Correct answer: (24)

The correct answer is C: x=24. The symbol 4! is read as “four factorial.” Factorial means multiplying the positive integers from 4 down to 1: 4!=4×3×2×1=24. Since the question states x=4!, replace the factorial by its value and obtain x=24. Option A, 16, is incorrect because it is 4×4, not factorial. Option B, 20, does not follow from the factorial calculation. Option C is correct. Option D, 28, is also not the product 4×3×2×1. Remember that 0!=1, while for a positive integer n, n!=n(n-1)(n-2)…1. Exam cue: expand the factorial completely before selecting an option.

Related tags

Factorial NotationPermutations CombinationsClass 11Easy

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