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The Handshake Puzzle: Stage 5 Solutions

 

If there are SIX people in a room and each shakes hand exactly once with everyone else in the room... 

There will be 15 handshakes.

If there are SEVEN people in a room and each shakes hand exactly once with everyone else in the room... 

There will be 21 handshakes.

If there are EIGHT people in a room and each shakes hand exactly once with everyone else in the room... 

There will be 28 handshakes.

 
 

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