SOLUTION: an urn contains 10 red balls and 20 green balls, if four are drawn one at a time without replacement, what is the prob. that the sequence of colors will be RED, GREEN, RED, GREEN?

Question 366552: an urn contains 10 red balls and 20 green balls, if four are drawn one at a time without replacement, what is the prob. that the sequence of colors will be RED, GREEN, RED, GREEN?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi, 

30 balls in the urn of which 10 are red and 20 are green

Drawing w/o replacement (after each draw, one less ball in the urn)

P(R,G,R,G) =  10/30 * 20/29 * 9/28 * 19/27 

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