#### Serena is in a math class of 𝟐𝟎 students. Each day for a week (Monday to Friday), a student in Serena’s class is randomly selected by the teacher to explain a homework problem. Once a student’s name is selected, that student is not eligible to be selected again that week.

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- What is the probability that Serena is selected on Monday?
- What is the probability that Serena is selected on Tuesday given that she was not selected on Monday?
- What is the probability that she will be selected on Friday given that she was not selected on any of the other days?