In my class of 20 students 7 are juniors 11 are seniors and, Ask an Expert

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In my class of 20 students, 7 are juniors, 11 are seniors, and 9 are senior biology majors.

a. What is the probability of choosing a senior from this group?

b. What is the probability of not choosing a junior?

c. What is the probability of choosing a senior or a biology major?

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