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1. \({10 \choose 3} = 120\) pizzas. We must choose (in no particular order) 3 out of the 10 toppings.

2. \(2^{10} = 1024\) pizzas. Say yes or no to each topping.

3. \(P(10,5) = 30240\) ways. Assign each of the 5 spots in the left column to a unique pizza topping.