(1) In how many ways $3$ vertices can be selected from a polygon of $10$ sides so that no vertices are consequent
(2) two squares are chosen at random from a chess board.
what is the probability that the two squares share a common side
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Bắt đầu bởi stuart clark, 28-05-2011 - 08:28
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Đã gửi 28-05-2011 - 08:28
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