SOLUTION: A bag contains five red and four blue marbles. Two are drawn together from the bag. Find the probability that
a) they are both red
b) they are both red if it is known that one
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-> SOLUTION: A bag contains five red and four blue marbles. Two are drawn together from the bag. Find the probability that
a) they are both red
b) they are both red if it is known that one
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Question 1119230: A bag contains five red and four blue marbles. Two are drawn together from the bag. Find the probability that
a) they are both red
b) they are both red if it is known that one marble is red Answer by addingup(3677) (Show Source):
You can put this solution on YOUR website! There are a total of 9 marbles. You take one, now there are a total of 8 marbles:
9*8 is going to be our denominator.
There are 5 possibilities for drawing the first red marble and 4 possibilities for drawing the second red marble. So, our numerator will be 5*4.
Put it all together:
(5*4)/(9*8) = 20/72 simplify and you get = 5/18 or 0.2778 or 27.78% probability
