Fruits

In the shop sell 4 kinds of fruits. How many ways can we buy three pieces of fruit?

Correct result:

x =  20

Solution:

C3(6)=(63)=6!3!(6−3)!=6⋅5⋅43⋅2⋅1=20 n=4 k=3  x=(n+k−1k)=(4+3−13)=20

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