Baskin Robbins' logo includes 31 because its stores offer 31 flavors of ice cream cones in sizes

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Baskin Robbins' logo includes "31" because its stores offer 31 flavors of ice cream cones in sizes small, medium, and large.
(a) How many different selections of cones are possible if each cone has one flavor?
(b) If 4 toppings are available to put on a cone, and a cone can be bought without a topping, how many different selections of ice cream cones are available if each cone has one flavor?
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