Combinations of sweaters

I have 4 sweaters two are white, 1 red and 1 green. How many ways can this done?

Result

n =  12

Solution:

n=4⋅ 3⋅ 2⋅ 1/(2⋅ 1)=12n=4 \cdot \ 3 \cdot \ 2 \cdot \ 1/(2 \cdot \ 1)=12

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