Dana confuses sweater and wool has a choice of seven colors. In how many ways can she choose from three colors to the sleeves?

Correct answer:

n1 =  35
n2 =  210

Step-by-step explanation:

C3(7)=(73)=7!3!(73)!=765321=35  n1=(73)=35=35
n2=7 6 5=210

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