Posted by Molly on Monday, November 15, 2010 at 10:05pm.
Four balls are simultaneously picked at random from a jar containing 2 red balls, 2 green balls, and 6 yellow balls.
What is the probability that exactly two of the selected balls will be red?

Math  Reiny, Monday, November 15, 2010 at 10:14pm
Using combination symbols,
prob = C(2,2)/C(10,2) = 1/45
or
prob = (2/10)(1/9) = 2/90 = 1/45

Math  Anonymous, Monday, December 3, 2012 at 8:45pm
it just says how many red balls are there
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