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Rachel has ribbons that are blue, green, red, orange, and ye

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Rachel has ribbons that are blue, green, red, orange, and yellow. To identify the plants in her garden, she ties either 1 ribbon, or 2 ribbons of different colors, to each plant. How many different plants can Rachel label in this way without labeling more than one plant the same way?

A. 5
B. 10
C. 15
D. 20
E. 25

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