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A bag has 4 green marbles, 3 red marbles, and 3 yellow marbles. What is the probability that you pick
a red marble, do not replace it, and pick another red marble?
 one year ago
 one year ago
A bag has 4 green marbles, 3 red marbles, and 3 yellow marbles. What is the probability that you pick a red marble, do not replace it, and pick another red marble?
 one year ago
 one year ago

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waterineyesBest ResponseYou've already chosen the best response.0
How many red marbles are there @4everjames ?
 one year ago

mubzzBest ResponseYou've already chosen the best response.1
Similar to last question, just some changes: In the beginning, the probability of a red marble is 3/10 After you've picked the first one and do not replace it, the probability of a red marble is 2/9. So your statement would be: Probability of red and red = Probability of 1st red * probability of 2nd red = (3/10) * (2/9) = 6/90 = 1/15
 one year ago

waterineyesBest ResponseYou've already chosen the best response.0
Yes.. And what are total number of marbles that bag has?
 one year ago

4everjamesBest ResponseYou've already chosen the best response.0
@mubzz thanksz!!!! i get it now thanks to u and @waterineyes
 one year ago

mubzzBest ResponseYou've already chosen the best response.1
An easy tip to solve all probability questions: When it says (prob of x) AND (prob of y) you multiply, i.e. (prob of x)*(prob of y) When it says (prob of x) OR (prob of y) you add, i.e. (prob of x)+(prob of y)
 one year ago

4everjamesBest ResponseYou've already chosen the best response.0
ok just for review (A bag has 5 red marbles, 6 blue marbles and 4 black marbles. What is the probability of picking a red marble, replacing it, and then picking a black marble?
 one year ago
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