A bag contains 3 red marbles, 4 blue marbles, and 5 white marbles. What is the probability of pulling out first a red, then a blue marble if none are replaced?

Question

anonymous · Answer

how i had this one! 9th grade right?

anonymous · Answer

total:12 marbles
red: 3/12 
blue: 4/11
so ur answer is :;
3/12 * 4/11

anonymous · Answer

do u need further explanning?

anonymous · Answer

no no no... your answer is: 3/12 *( 4/11) = .09090909

anonymous · Answer

bec first what is the probability of getting a red: well, we have 3 reds and there are 12 balls so that would be 3/12 . then we want to pick a blue. and we have 4 blue but we only have 11 balls. so that would be 4/11. and you want the probablity of BOTH so put them together: