SOLUTION: Suppose that a jar contains 4 pens: 2 black, 1 blue, and 1 red. Three people select a pen at random from the jar, sign a document, and replace the pen in the jar before the next pe
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-> SOLUTION: Suppose that a jar contains 4 pens: 2 black, 1 blue, and 1 red. Three people select a pen at random from the jar, sign a document, and replace the pen in the jar before the next pe
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Question 872090: Suppose that a jar contains 4 pens: 2 black, 1 blue, and 1 red. Three people select a pen at random from the jar, sign a document, and replace the pen in the jar before the next person selects a pen. What is the probability that none of the people use the red pen to sign the document? Answer by ewatrrr(24785) (Show Source):
You can put this solution on YOUR website! 4 pens: 2B,1Blu, 1R
selected 1 (and replaced it in jar)!! mix stays the same for all three
P(a person selects no red) = 3/4
P(1st and 2nd and 3rd do not choose red) = = 27/64
Not: 'and' indicates the multiplication
