Someone can purchase 18 inch dolls from a number of companies such as amazon. Amazon has a large selection of 18 inch dolls from a number of different manufacturers.
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She had 21 dolls.
18 inch
.18=about 2 134/833 in
Here is another way to phrase the question: If 18 out of 20 customers make a purchase in a shop, and three customers are selected at random, what is the probablity that all will make a purchase? Each random customer has a 18/20 chance of being one that purchased, so the probability that all three make a purchase is 18/20*18/20*18/20=.729
18 inches