how many 4 digit combinations can be made from the digits 3, 3, 4, and 6?

How many four digit combinations can be made from the sigits 3, 3, 4, and 6?
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There are 6 ways of arranging the digits 3, 4 and 6. The other digit can be fitted in three different places between the other digits. So that makes 3*6=18 arrangements of the four digits.

 

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