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Why is selecting (0) pens from (10) pens considered one way?

Answer and explanation

Correct answer: Because choosing no pen gives only the empty set as the selected group

When 0 pens are selected, the selected group is the empty set. Leaving out all 10 pens always gives this same single group; hence \(\binom{10}{0}=1\). Option B is incorrect because excluding different individual pens does not create different selections when no pen is selected. Exam tip: In general, \(\binom{n}{0}=\binom{n}{n}=1\).

Related tags

CombinationsBinomial CoefficientsEmpty SetClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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