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How many total ways are there to choose (3) or (4) objects from (10) distinct objects?

Answer and explanation

Correct answer: 330

The number of ways to choose 3 objects is \(\binom{10}{3}=120\), and the number of ways to choose 4 objects is \(\binom{10}{4}=210\). A selection cannot contain both exactly 3 and exactly 4 objects, so these cases are mutually exclusive and their counts are added: \(120+210=330\). Therefore, the correct answer is 330. A value such as 340 is incorrect because the required combination counts add exactly to 330. Exam tip: For mutually exclusive cases joined by “or,” add the number of ways in the separate cases.

Related tags

CombinationsSelectionAddition PrincipleMutually Exclusive CasesPermutations And CombinationsMathematicsClass 11 Mcq

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