SOLUTION: please help. Katarina has nine pairs of shoes to arrange in her closet. Assuming that she doesn't separate the pairs, how many different arrangements can she make?

SOLUTION: please help. Katarina has nine pairs of shoes to arrange in her closet. Assuming that she doesn't separate the pairs, how many different arrangements can she make?

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Question 611967: please help.
Katarina has nine pairs of shoes to arrange in her closet. Assuming that she doesn't separate the pairs, how many different arrangements can she make?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
Does that mean that she keeps the pairs together or not?
forced pairs
9*8*7*6*5*4*3*2*1
ie 9!
pairs not forced
18*17*16*15*14*13*12*11*10*9*8*7*6*5*4*3*2*1
ie 18!
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