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# [1] How many ways can k rooks be placed on a nxn chessboard so that they don’t attack each other.
#8 x
# 9y
#8 [1] How many ways can k rooks be placed on a nxn chessboard so that they don’t attack each other.
# (romanian county olympiad, 11th grade 2000 [1]) How many permutations of length n have no fixed points. A fixed point in a permutation p is p(i) = i
# (county level olympiad, 1994 [1]) How many correct bracket sequences of length 2n are there.
# (10th grade math course) How many paths are there on a grid from 1,1 to n, m if at each step you can either increase your x coordinate or increase your y coordinate.
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