19. The team plays on Friday given that it is 1:00 pm.
Contrapositive: It is not 1:00 pm given that the team does not play on Friday.
20. I did not wake up early assuming that the project is not due Sunday.
Contrapositive: The project is due Sunday assuming that I woke up early.
39. Karl is a red hat assuming that the cat is white.
Contrapositive: The cat is not white assuming that Karl is not a red hat.
40. Harry went to the store if Harry was not playing soccer.
Contrapositive: Harry was playing soccer if Harry did not go to the store.
78. Dinner went out Tuesday night given that Darrell has a test.
Contrapositive: Darrell does not have a test given that dinner did not go out Tuesday night.
79. If the team plays on Tuesday then the project is due Wednesday.
Contrapositive: If the project is not due Wednesday then the team does not play on Tuesday.
80. Adrian goes to the store then the team plays on Tuesday.
Contrapositive: The team does not play on Tuesday then Adrian does not go to the store.
81. Prepare dinner tomorrow after dinner given that Tulip is done homework.
Contrapositive: Tulip is not done homework given that dinner is not prepared tomorrow after dinner.
Parent Tip: Review the logic above to help your child master the concept of counterexample worksheet.
