SOLUTION: A jar contains 15 blue and 10 red marbles. a) If one marble is drawn at random, what is the probability that it is red? b) If two marbles are drawn at random, what is the probabi

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Question 142862: A jar contains 15 blue and 10 red marbles.
a) If one marble is drawn at random, what is the probability that it is red?
b) If two marbles are drawn at random, what is the probability that the first is red and the second is blue if the first marble is replaced in the jar prior to drawing the second marble?
c) What is the probability that both are red if the first marble is not returned to the jar prior to drawing the second marble?


(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.)
Answer by psbhowmick(878) About Me  (Show Source):
You can put this solution on YOUR website!
a) Reqd. probability = 10C%5B1%5D%2F%2825C%5B1%5D%29+=+10%2F25+=+0.4
b) Reqd. probability = %2810C%5B1%5D+x+15C%5B1%5D%29%2F%2825C%5B1%5D%29%5E2+=+0.24
c) Reqd. probability = 10C%5B2%5D%2F%2825C%5B2%5D%29+=+0.15