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What is the value of 6!?

Answer and explanation

Correct answer: 720

Factorial notation means multiplying every positive integer from the stated number down to 1. Thus, 6! = 6 × 5 × 4 × 3 × 2 × 1. Computing in convenient groups gives 6 × 5 = 30, 4 × 3 = 12, and 2 × 1 = 2; therefore 30 × 12 × 2 = 720. Hence option C is correct. A useful independent check is the recurrence 6! = 6 × 5!, and since 5! = 120, we get 6 × 120 = 720. Option A is only 5!, while options B and D result from incomplete or incorrect multiplication. The definition and recurrence both confirm the same answer.

Related tags

Factorial NotationNumerical EvaluationPermutations And CombinationsClass 11MathematicsClass 11 Mcq

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