SOLUTION: There are four mailboxes outside a post office. In how many ways can three letters be deposited into the 4 boxes?

SOLUTION: There are four mailboxes outside a post office. In how many ways can three letters be deposited into the 4 boxes?

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Question 931597: There are four mailboxes outside a post office. In how many ways can three letters be deposited into the 4 boxes?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
1 in each of 3 boxes: 4C3 = 4
2 in one AND 1 in one of other three: (4C1)(3C1) = 12
3in one: 4C1 = 4
20 ways in All
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