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In how many ways can an even number of coins be selected from (12) different coins?

Answer and explanation

Correct answer: 2048

The total number of subsets of 12 coins is \(2^{12}\). The numbers of selections of even size and odd size are equal, so the number of even-size selections is \(\frac{2^{12}}{2}=2^{11}=2048\). This includes the selection of 0 coins; excluding it would give 2047. Exam tip: for \(n\) distinct objects, the number of even-sized subsets is \(2^{n-1}\).

Related tags

CombinationsEven SubsetsBinomial TheoremClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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