Holly chooses seven out of nine plants for the front of her house with the remaining plants to be used on the side of the house. If order does not matter, in how many ways can she choose the plants for the front of the house?

Choosing 7 of the 9 plants is a combination because the order of selection does not matter. The number of ways is 9 choose 7, which equals 9 choose 2: (9 × 8) ÷ (2 × 1) = 36. So there are 36 ways to choose the plants for the front of the house.

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