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Find the value of C(10, 3).

Answer and explanation

Correct answer: 120

The notation C(10,3) represents the number of ways to choose 3 objects from 10 when the order of the chosen objects does not matter. Use the combination formula C(n,r) = n!/[r!(n−r)!]. Substituting n = 10 and r = 3 gives C(10,3) = 10!/(3!7!) = (10 × 9 × 8)/(3 × 2 × 1) = 720/6 = 120. Therefore option C is correct. The value 720 is the product 10 × 9 × 8 and corresponds to P(10,3), where order is counted. Dividing by 3! is essential because the same three objects can be arranged in six orders but represent only one selection. Options A and B result from incomplete or incorrect simplification.

Related tags

CombinationsFactorialSelectionCountingPermutations And CombinationsMathematicsClass 11 Mcq

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