SOLUTION: A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles ar

Question 390993: A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi,         

P(choosing one red from the full bag) = 10/13

P(choosing 2 red, replacing the first) = 10/13*10/13 = 100/169 = .5917



Note: w/o replacement, that is, first red marble gone from bag:  P = 10/13*9/12 

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