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How many ways are there to choose (2) flowers from (7) different flowers?

Answer and explanation

Correct answer: 21

This is a selection of 2 flowers from 7 different flowers where order does not matter. Therefore, the number of ways is \(\binom{7}{2}=\frac{7!}{2!\,5!}=\frac{7\times6}{2}=21\). The value \(42\) would arise if order mattered, making it an arrangement question. Exam tip: For words such as “choose” or “select,” usually use combinations, \(nCr\).

Related tags

CombinationsPermutations And CombinationsClass 11SelectionNcrMathematicsClass 11 Mcq

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