In how many ways can a meal consisting of a pizza with 3 toppings, 5 different beverages, and a dessert be chosen? The menu shows that there are 6 toppings for the pizza, 6 beverages, and 5 desserts offered.

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if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads