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OpenStudy (anonymous):
Joe wants to buy a pair of shoes. His shoe size is available in 4 designs and 5 colors in a particular shop. From how many combinations of designs and colors can he choose? a. 4 c. 15 b. 5 d. 20
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OpenStudy (nory):
There are 4 designs and 5 colors, so by the multiplication principal, the answer is 4 * 5 = 20.
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