Algebra

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Mr. Rodney's English class is made up of 28 students. He has 6 ESL students, 10 remedial students, and 5 advanced learners. ESL students make up 1/5 of the remedial students and 3/5 of the advanced learners.
1. What is the probability that a student is ESL and remedial?
2. What is the probability that a student is ESL and an advanced learner?
3. What is the probability that a student is remedial and NOT ESL?
I really don't understand how to do any of these...

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