SOLUTION: How many different arrangements of the letters of the word "doodle" are possible? Thank You

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Question 41638: How many different arrangements of the letters of the word "doodle" are possible?
Thank You
Answer by Nate(3500) About Me  (Show Source):
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"doodle"
There are a total of six letters; "d" is repeated twice, and "o" is repeated twice.
6%21%2F%282%212%21%29
%286%2A5%2A4%2A3%2A2%2A1%29%2F%284%29
%286%2A5%2A3%2A2%2A1%29
180