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the marbles you select is blue and the other is red? a jar contains four blue marbles...
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High School Teacher
The number of red marbles is 2
The number of blue marbles is 4.
==> Total number of marbles is 6.
1. First, you choose one marble .
==> Then, the probability of choosing a red is p(red)= 2/6 = 1/3
==> The probability of choosing a blue marble is p(blue) = 4/6 = 2/3
2. Now you choose a second marble.
We have two possibilities.
a. If the first is red, ==> p(red)= 1/5
==> p(blue) = 4/5
b. If the first was blue, ==> p(red) = 2/5
==> p(blue) = 3/5
Posted by hala718 on March 26, 2012 at 10:42 AM (Answer #1)
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