1. In how many ways is it possible to choose a white square and a black square on a chessboard so that the squares must not lie in the same row or column?
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By: anil on 05 May 2019 02.30 am
First a black square can be selected in 32 ways. Out of remaining rows and columns, 24 white squares remain. 1 white square can them be chosen in 24 ways. So total no. of ways of selection is 32*24 = 768.
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