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March 27, 2017

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Consider a class with 10 sophomores, 8 juniors, and 6 seniors. Two students are selected at random.

1) What is the probability of selecting 1 junior and 1 senior.


2) Find the odds of selecting two students who are not seniors.

How do I set these up to solve??

Any help is greatly appreciated!!

  • Pre-Calculus - ,

    the total students are 24.
    Probability of 1junior and 1 senior are..
    Pr=(8/24)(6/23)

    The second:
    Pr=(18/24)(17/23)

    Notice in each, the numerator is the number of possible ways to be successful,the denominator is the number of ways it can go.

  • Pre-Calculus - ,

    For number one, there is a total of 24 students when you add 10+8+6. Then you want to find 1 junior and 1 senior which added up becomes 2. soo....

    2/24 = 1/12 reduced! :)

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