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In how many ways can an odd number of toys be selected from (8) different toys?

Answer and explanation

Correct answer: 128

The total number of subsets of 8 distinct toys is \(2^8=256\). By including or excluding one fixed toy, every even-sized selection can be paired with an odd-sized selection. Hence, the numbers of even-sized and odd-sized selections are equal, so the required number is \(256/2=128\). The value \(127\) is the number of non-empty even selections after excluding the empty selection, not the number of odd selections. Exam tip: For \(n\) distinct objects, the number of odd-sized selections is \(2^{n-1}\).

Related tags

CombinationsOdd SelectionsSubsetsClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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