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Parity of numbers (odd/even behavior)
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5-point ladder

Parity of numbers (odd/even behavior), 5-point ladder

●●●5 points, difficulty 3 of 35 pt

Needs an idea, not just a procedure.

3 in a row to finish this ladder.

0/6 solved

KA-0028

about 135s

Seven cups all stand upside down. In one move you must turn over exactly two cups. Can all seven ever stand the right way up?