Dana confuses me that sweaters and wool have a choice of seven colors. In how many ways can she choose from three colors for the sleeves?

Correct answer:

n1 =  35
n2 =  210

Step-by-step explanation:

C3(7)=(37)=3!(73)!7!=321765=35  n1=(37)=35
n2=7 6 5=210

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