Homework Help: Math

Posted by B.B. on Friday, August 7, 2009 at 3:41pm.

Could someone please let me know if I did this problem right?
A bag contains seven blue marbles and five red marbles. One marble is drawn at random without replacement, and then a second marble is drawn. What is the probability that the second marble is blue if the first marble was blue?
I say 6/11, is this right?
Thanks.

Math - drwls, Friday, August 7, 2009 at 3:58pm
If the first drawn marble was blue, there are 6 blues and 5 reds left. Yes, the answer is 6/11.

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