math

Mr. Hauseman has 17 students in his class, three of whom are freshmen, and the rest are from other classes. He is going to draw two students randomly to be partners.

He calculates the probability of drawing a freshman and then a junior to be
9
136
. How many juniors must be in the class?

  1. 👍 0
  2. 👎 0
  3. 👁 75
  1. 3/17 are freshmen
    If there are x juniors, then
    P(freshman,junior) = 3/17 * x/16 = 3x/272 = 9/136
    so, x=6

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