KA-0121
about 90sEveryone at a meeting shakes hands with everyone else exactly once. There are 66 handshakes in total. How many people are there?
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Two steps, or one step plus a trap.
3 in a row to finish this ladder.
0/3 solvedEveryone at a meeting shakes hands with everyone else exactly once. There are 66 handshakes in total. How many people are there?