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# the marbles you select is blue and the other is red?  a jar contains four blue marbles...

dareg17 | Student, Grade 10 | Honors

Posted March 26, 2012 at 10:02 AM via web

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the marbles you select is blue and the other is red?

a jar contains four blue marbles and two red marbles.  suppose you choose a marble at random and do not replace it. then you choose a second marble.  find the probility of each event.

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted March 26, 2012 at 10:42 AM (Answer #1)

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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

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