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Dina's collection of twelve albums includes one rock album. Dina will choose two of her albums to play on a road trip. (Assume order

Dina's collection of twelve albums includes one rock album. Dina will choose two of her albums to play on a road trip. (Assume order is not important.) a) How many different sets of two albums could she choose? b) How many of these sets would not include the rock album? c) How many of them would include the rock album?

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