There are 3 red and 7 yellow plums. I take 2 plums continuously. How much is the probability that both are yellow plums.

I found the solution 7/10*6/9=7/15.

7/10 is the first probability of a yellow plum but what is 6/9 ? How to get this 6/9 ?

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- Jul 31st 2005, 02:05 AMtotalnewbieLikelihood
There are 3 red and 7 yellow plums. I take 2 plums continuously. How much is the probability that both are yellow plums.

I found the solution 7/10*6/9=7/15.

7/10 is the first probability of a yellow plum but what is 6/9 ? How to get this 6/9 ? - Jul 31st 2005, 07:47 AMMath Help
You have 10 plums total so 7/10 is the probability that the first plum is yellow.

Once you have picked one yellow plum, there are only 6 yellow plums left and 9 plums total so the new probability is 6/9.