(a) What is a combination of r elements of a set? How many combinations are there of n elements taken r at a time? (b) How many subsets does a set with n elements have? (c) A pizza parlor offers ten different toppings. How many three-topping pizzas are possible? How many pizzas are possible?

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(a) What is a combination of r elements of a set? How many combinations are there of n elements taken r at a time? (b) How many subsets does a set with n elements have? (c) A pizza parlor offers ten different toppings. How many three-topping pizzas are possible? How many pizzas are possible?

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(a) What is a combination of r elements of a set? How many combinations are there of n elements taken r at a time?

(b) How many subsets does a set with n elements have?

(c) A pizza parlor offers ten different toppings. How many three-topping pizzas are possible? How many pizzas are possible?

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