Math Question

Answer the questions below.
(a) There are 15 European cities that Kim would eventually like to visit. On her next vacation, though, she only has time to visit 3 of the cities: one on Monday, one on Tuesday, and one on Wednesday. She is now trying to make a schedule of which city she'll visit on which day. How many different schedules are possible? (Assume that she will not visit a city more than once.)
(b) From a collection of 52 store customers, 2 are to be chosen to receive a special gift. How many groups of 2 customers are possible?



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