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When 2 people shake hands with one another, that counts as 1 handshake. Every person in a room shakes hands with each other exactly once. There r total of 15 handshakes,how many poeple r in the room
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by SolSun at March 06, 2010

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The number of handshakes with a room full of n people is [n(n-1)]/2. So, there are 6 people in the room.

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Delta March 06, 2010