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If two squares are chosen at random on a chessboard, what is the probability that they have a side in common? |
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Answer» 1/18 6 possibilities for 1ST square Corners, leftmost column, rightmost column, topmost ROW, bottomost row, others Corners have 2 cells that can share a side Other 4 have 3 cells that share a side Others = 4cells Answer (4*2 + 24*3+36*4)/(64*63) =1/18 |
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