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9Â years, 3Â months ago
if 2 black squares are selected on chess board.find the probability they lie on same row or column?
9Â years, 3Â months ago
Total black squares on chess board are 32.
For the required case, lets say you select any first square, now for selecting 2nd square, you only have 7 choices. So the correct answer should be 7/31
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