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

Answer and explanation

Correct answer: 128

The total number of subsets of 8 distinct coins is \(2^8=256\). The selections containing an even number of coins are \(\binom80+\binom82+\binom84+\binom86+\binom88\). The numbers of even-sized and odd-sized subsets are equal, so the number of even selections is \(2^8/2=2^7=128\). Option 127 omits the one way of selecting zero coins. Exam tip: Use \((1+1)^n\) and \((1-1)^n\) to show that the sums of even and odd binomial terms are equal.

Related tags

CombinationsEven SubsetsBinomial TheoremClass 11Permutations And CombinationsMathematicsClass 11 Mcq

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