Math121 Discussion - 7th week

# Math121 Discussion - 7th week - MATH 121 DISCUSSION WEEK 7...

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MATH 121 DISCUSSION WEEK 7 WORKSHEET 1) For a company lunch, the manager has decided to order pizza. (a) Suppose the manager can only order pizzas with up to three different toppings: pepperoni, sausage, and green peppers. How many different kinds of pizza can he order? (b) Suppose the manager has n toppings to choose from (where n is an arbitrary number). How many different kinds of pizza can he order? 2) Suppose there are 82 economics majors at a university. Of these majors, 32 students are currently enrolled in Microeconomics, 38 are currently enrolled in Macroeconomics, and 33 are enrolled in Econometrics. 5 students are enrolled in all three classes. 15 students are enrolled in both Micro and Econometrics, 20 students are enrolled in both Macro and Econometrics, and 11 are enrolled in both Micro and Macro. (a) How many econ majors are enrolled in only Microeconomics? (b) How many econ majors are enrolled in Microeconomics or Macroeconomics?
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