Homework Help Forum: college

Posted by Jess on Wednesday, November 4, 2009 at 3:35am.

Given 24 pens, either red or blue. If 4 are blue, what is the probability of you select 2 pens AT LEAST 1 will be blue. (without replacement, that is, you are taking 2 separate pens)

• Probability - drwls, Wednesday, November 4, 2009 at 5:19am

  Add the probabilities of: blue-red, red-blue and blue-blue. (4/24)*(19/23) + (20/24)*(4/23) + (4/24)(3/23) = [76 + 76 + 12)/552 = 164/552 = 41/138

  
  

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