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A soccer team consists of five girls and four boys. (All the players are distinguishable.) How many ways can they stand in line for a photograph, so that at least two of the girls are standing next to each other?

 Mar 17, 2020
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First we want to count the number cases without any restriction which is 9! Then we count the number we don't want which is 5*4*4*3*3*2*2*1*1 = 2880. 9!-2880 = 360000.

 Mar 17, 2020

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