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Selections of a few objects
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3-point ladder

Selections of a few objects, 3-point ladder

●○○3 points, difficulty 1 of 33 pt

One step from a skill you know.

3 in a row to finish this ladder.

0/1 solved

KA-0035

about 45s

Eight people meet and everyone shakes hands with everyone else exactly once. How many handshakes take place?