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Which expression gives the number of non-empty selections from 6 distinct coins?

Answer and explanation

Correct answer: 2⁶ - 1

For each of the 6 distinct coins, there are exactly two independent choices: include it in the selection or leave it out. By the fundamental principle of counting, the total number of subsets is therefore 2 × 2 × 2 × 2 × 2 × 2 = 2⁶. This total includes the empty selection, in which no coin is chosen. Removing that one case gives 2⁶ − 1 = 63 non-empty selections. Hence option C is correct. The expression 6! − 1 counts neither subsets nor selections correctly, because factorial concerns arrangements. ⁶P₁ counts only one-coin ordered choices, while ⁶C₂ counts selections of exactly two coins, not all possible non-empty sizes.

Related tags

Non Empty SelectionSubsetsFundamental CountingFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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