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What is the total number of handshakes among (10) persons taken (2) at a time?

Answer and explanation

Correct answer: 45

A handshake forms a pair of two persons, and the order of the two people does not matter. Hence, the total number of handshakes is \(\binom{10}{2}=\frac{10\times9}{2}=45\). The value 90 can result from counting ordered pairs, which counts each handshake twice. Exam tip: For handshake questions, usually use \(\binom{n}{2}\).

Related tags

CombinationsHandshakesClass 11Permutations And CombinationsPairsMathematicsClass 11 Mcq

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