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In how many ways can a practice group of 4 players be selected from 11 players?

Answer and explanation

Correct answer: 330

This is a selection problem, so the governing concept is combination rather than permutation. A practice group has no first, second, third, or fourth position; the same four players form one group regardless of their listing order. Therefore, calculate 11C4 = 11!/(4!7!) = (11×10×9×8)/(4×3×2×1) = 7920/24 = 330. Thus option C is correct. Option A is only 11×4 and ignores the selection structure. Option B is not the value of 11C4. Option D is the numerator before division by 4!, so it counts arrangements of each group and overcounts every group 24 times. The supplied answer is corrected to C.

Related tags

CombinationsGroup-SelectionClass11OvercountingPermutations And CombinationsMathematicsClass 11 Mcq

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