We want to draw a number of straight lines such that for each square of a chessboard, at least one of the lines passes through an interior point of the square. At least how many lines we need for a 3x3 chessboard?

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Answer 1 · 2018-03-22T01:57:58

I tried this :

enter image source here
we need at least 2 straight lines for a 3x3 chessboard. :)