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A bag contains 4 white balls, 6 yellow balls, and 5 red balls. In how many ways can 6 balls be chosen if there must be 2
balls of each color? Which of the following combination notation will best represent the problem?
A. 15C2
B. 15C6
C. 4C2 • 6C25C2 D. 4C2 +6C25C2​