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How many subsets with at least (6) elements does a set of (8) elements have?

Answer and explanation

Correct answer: 37

A subset with at least 6 elements can have 6, 7, or 8 elements. Therefore, the required number is
\(\binom{8}{6}+\binom{8}{7}+\binom{8}{8}=28+8+1=37\). Option 28 counts only the subsets having exactly 6 elements, so it is not correct. Exam tip: For “at least,” add combinations from the stated size up to the maximum size.

Related tags

CombinationsSubsetsNcrPermutations And CombinationsSet TheoryCountingMathematicsClass 11 Mcq

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