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Inclusion–exclusion with two sets
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4-point ladder

Inclusion–exclusion with two sets, 4-point ladder

●●○4 points, difficulty 2 of 34 pt

Two steps, or one step plus a trap.

3 in a row to finish this ladder.

0/2 solved

KA-0069

about 75s

In a class of 30, 18 play football and 14 play chess. 6 play both. How many play neither?