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Question 172:



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To choose 3 with replacement out of 18 is denoted as 18 choose 3, which you can type directly into google. It shows that with just 18 titles, there are still 816 combiations (type 18 choose 3).

The formula is         

p! (n-p)!

Where n is the total set you're choosing from and p is the selection. In this example, n is 18 and p is 3.

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