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4-point ladder

Find what is actually being asked, 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-0154

about 105s

In a class of 30 students, 18 play football and 15 play chess. Exactly 7 students do both. How many students play neither?