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How many ways are there to choose exactly (2) sweets from (6) sweets?

Answer and explanation

Correct answer: 15

Only a selection of 2 sweets from 6 is required, so the order of selection does not matter. Hence, the number of ways is \(\binom{6}{2}=\frac{6\times5}{2\times1}=15\). The value 30 would result if order were counted, using the permutation \(^{6}P_2\). Exam tip: When a question says “choose” or “select” and does not mention order, use combinations.

Related tags

CombinationsPermutations And CombinationsClass 11SelectionBinomial CoefficientMathematicsClass 11 Mcq

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