How many total handshakes were there? Once upon a time, a king called for his 7 wisest men to be assembled in a room, with no one but them. All 7 men came in and shook their hands once with each of them.
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6 + 5 + 4 + 3 + 2 + 1 = 21 handshakes
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21 (6+5+4+3+2+1)... ...........
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