A student has a collection of 9 CDs: 4 by The Beatles, 3 by ABBA, and 2 by The Rolling Stones. She selects 4 CDs from her collection. Calculate the number of ways she can make the selection if it must contain exactly 2 CDs from one group and 2 CDs from another group.

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A student has a collection of 9 CDs: 4 by The Beatles, ... | Mathematics MCQ #54 | Examora | Examora