Problems:
Problem 1: Kisses
Problem 2: Linen Shop or Pizzeria
Problem 3: Dominoes
Problem 4: Get Well Soon
Problem 1: Kisses
Ten people arrive at a party. As they arrive, each person kisses every other person twice, once on each cheek. How many kisses are there?
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Problem 2: Linen Shop or Pizzeria
A linen shop sells sheets, duvet covers, and pillow cases. Linens from the Easirest company offer a choice in each color: a plain sheet or a sheet with a pattern, a plain duvet cover or a duvet cover with a pattern, plain pillow cases or pillow cases with a pattern. Customers may mix and match the plain or patterned sheets, duvet covers, and pillow cases in any combination they wish. To help the shop make its next order from the Easirest company, you have been asked to make a record of the different combinations that customers have chosen. How many different combinations are possible?
Some students might be more interested in pizza. The same problem might occur in a pizzeria.
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Problem 3: Dominoes

A tree diagram is a useful type of list. For example, the game of dominoes is played with black and white tiles. Each tile is divided into two halves and on each half a number from 06 is represented in the form of dots. Each tile contains a pair of numbers and each pair appears only once in a complete set. How many tiles are there in a complete set of tiles? The solution to this problem can take the form of a tree diagram. 
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Problem 4: Get Well Soon
Melike and Funda are good friends. When Melike got the flu, her doctor wrote a prescription for twenty 30mg pills, and told her to take two a day, one after breakfast and one after dinner. Three days later, Funda also got the flu. Her doctor prescribed thirty 20mg pills, and told her to take a pill every four hours between 9:00 and 21:00. Whose medicine was finished first?
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