SOLUTION: Lina has three pairs of boots. They are leather, rain, and hiking boots. If she reaches into her closet to get two boots out at a time, what are all of the possible combinations?

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There are 2*3 = 6 items (boots) in the closet. I multiplied 3 by 2, because each pair has two boots.


The number of combinations of 6 items taken 2 at a time is   =  = 3*5 = 15.    ANSWER.