- #1
zeion
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Homework Statement
This was an example given in class but I didn't understand how the answer was derived.
Suppose we draw 3 balls without replacement from an urn with 2 red, 2 green, and 2 blue balls. Define the following random variables:
R = number of red balls drawn
G = number of green balls drawn
B = number of blue balls drawn
What is the probability mass function of R?
0 -> 24/120
1 -> 72/120
2 -> 24/120
Homework Equations
The Attempt at a Solution
I don't understand how to get those ratios.
For 0 red balls, there will be either 2G 1B or 2B 1G.