100 Day Summer Challenge

100 problems in 100 days. #100problems

Day 63

63 of 100: 40 Matchsticks

Logic Level 3

The diagram above shows 40 matchsticks arranged in a square grid.

What is the fewest number of matchsticks that need to be removed so that there are no squares (of any size) remaining?

Try the problem on a smaller grid first.

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