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If 11 persons meet at a reunion and each person shakes hands exactly o

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Tough and Tricky questions: Combinations.



If 11 persons meet at a reunion and each person shakes hands exactly once with each of the others, what is the total number of handshakes?

A) 11 10 9 8 7 6 5 4 3 2 1
B) 10 9 8 7 6 5 4 3 2 1
C) 11 10
D) 55
E) 45

Kudos for a correct solution.

Source: Chili Hot GMAT

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