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What is the value of 6!/(2! × 4!)?

Answer and explanation

Correct answer: 15

The expression is a factorial quotient. Use 6! = 6 × 5 × 4!, while 2! = 2. Then 6!/(2! × 4!) = (6 × 5 × 4!)/(2 × 4!) = (6 × 5)/2 = 30/2 = 15. Thus option C is correct. This expression is also the combination value 6C2, which counts selections of two objects from six, and it equals 15. Option A, 10, can come from using an incorrect cancellation; option B misses the division by 2; and option D results from failing to divide by the remaining 2. The safest method is to cancel the common 4! before performing the arithmetic.

Related tags

Factorial NotationCombinationsClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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