# Math

A bag contains 9 red marbles, 8 white marbles, and 6 blue marbles. You draw 4 marbles out at random, without replacement. What is the probability that all the marbles are red?

1 The probability that all the marbles are red is...?
2 What is the probability that exactly two of the marbles are red?
The probability that exactly two of the marbles are red is..?
3 What is the probability that none of the marbles are red?
The probability of picking no red marbles is..?

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1. 9/23 bc there is 9 red marbles and 23 marbles al together

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2. ^ that is actually wrong, because you are getting 4 marbles out of the bag...

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3. I did the first 2 parts here:

http://www.jiskha.com/display.cgi?id=1447035932

#3.
prob(none of the 4 are red)
= C(14,4)/C(23,4)
= 1001/8855
= 13/115

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