摘要: Read the following SAT test question and then click on a button to select your answer. Cathy likes to wear 2 ribbons, each...
Read the following SAT test question and then click on a button to select your answer.
Cathy likes to wear 2 ribbons, each a different color. If she has 6 ribbons each of a different color, how many combinations of 2 different-colored ribbons can she select to wear?
3- 6
- 12
- 15
- 36
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