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OpenStudy (dan815):
suppose there are 2 rows, 10 chairs in the first row and 10 chairs in the 2nd row, there are 10 couples, how many ways can the couples sit such that, no girl ever sits in front of her boy friend, and all the girls have to sit in first row and the boys in 2nd row
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OpenStudy (dan815):
im going to modify this question slightly so that order doesnt matter, suppose these "rows" are circular
ganeshie8 (ganeshie8):
derangement problem ?
Parth (parthkohli):
noooo!
Parth (parthkohli):
yeah, derangements.
OpenStudy (dan815):
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