1.

12 People {a1, A2, A12} Meet And Shake Hands In A Circular Fashion. In Other Words, There Are Totally 36 Handshakes Involving The Pairs, {a1, A2}, {a2, A3}, {a11, A12}, {a12, A1}. Then Size Of The Smallest Set Of People Such That The Rest Have Shaken Hands With At Least One Person In The Set Is?

Answer»

12 X 11 / 2 = 66 HANDSHAKES.

12 x 11 / 2 = 66 Handshakes.



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