1.Which of the following events has a probability of 0?

A: The sun will shine all day on January 1st in Portland, Oregon

B: I will win the lottery if I buy one ticket

C: Tomorrow will be Monday if today is Saturday

C only

All of them

A and C

B and C

A only

2.The permutation formula can be used to determine which of the following?

A: The number of possible license plates made with three letters and three digits given that repetition is allowed

B: The number of ways of choosing 6 CDs from 20 to bring on vacation

C: The number of ways of choosing a first place winner and a second place winner from 10 finalists

A only

C only

A and C

A and B

B and C