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From (8) toys, (3) toys are to be selected and one broken toy must not be selected. How many ways are there?

Answer and explanation

Correct answer: 35

Since one toy is broken, it is not available for selection. Thus, 3 toys must be chosen from the remaining 7 good toys. As the order of selection does not matter, the number of ways is \,\(\binom{7}{3}=35\). Option 56 equals \(\binom{8}{3}\), which incorrectly includes the broken toy. Exam tip: use combinations when objects are selected and their order is irrelevant.

Related tags

CombinationsPermutations And CombinationsClass 11SelectionCounting PrinciplesMathematicsClass 11 Mcq

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