SOLUTION: How many different arrangements of the digits “2012” are there?

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Question 580622: How many different arrangements of the digits “2012” are there?
Answer by dfrazzetto(283) About Me  (Show Source):
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2 is repeated so only 3 distinct choices for first term:
3*2*2*1 - 12
2012
2021
2120
2102
2210
2201
1022
1202
1220
0221
0212
0122