Probability At Least Two Red Marbles

I am looking more for how to do this than the actual answer.

Probability at least two red marbles. The probability of picking a yellow marble. Either count the total number of marbles that aren t red and divide by the total number of marbles or calculate. What is the probability the third marble is the first red marble. A ball is drawn at random from each bag.

And so this is sometimes the event in question right over here is picking the yellow marble. So the sum of the probabilities of those four scenarios will be the answer. Two red sweets b no red sweets. Ii both are black.

Two ways to get this. Drawing simultaneously is the same as sampling without. Iv at least one red. P at least one red p rr or rb or br alternatively p at least one red 1 p no reds complementary events 1 p bb and so on.

A draw the tree diagram for the experiment. A jar contains 4 black marbles and 3 red marbles. The probability of exactly successes out of trials is given by. The first red a jar contains 30 red marbles 12 yellow marbles 8 green marbles and 5 blue marbles you draw and replace marbles 3 times.

The probability of getting sam is 0 6 so the probability of alex must be 0 4 together the probability is 1 now if you get sam there is 0 5 probability of being goalie and 0 5 of not being goalie. But i can t figure out how to do it with at least two. Two marbles are drawn without replacement. If you get alex there is 0 3 probability of being goalie and 0 7 not.

B find probabilities for p bb p br p rb p ww p at least one red p exactly one red 3. Determine the probability that at least one is red. We ll call this second number. First we show the two possible coaches.

I both are red. I know how to do at least one blue marble 1 5 choose 3 11 choose 3. Iii one black and one red. We calculated p drawing a non red 455.

A sample of three marbles is selected. So at least two red marbles means the following scenarios where r stands for the probability of picking a red marble and n stands for the probability of picking a non red marble. Where is the number of ways to select things from a collection of things and is equal to. Bag b contains 12 marbles of which 4 are red and 8 are black.

B the probability that. So they say the probability i ll just say p for probability. I am using combinations. The probability of three reds is 7 20.

Two marbles are drawn simultaneously from the bag. Two marbles are drawn without replacement from a jar containing 4 black and 6 white marbles. But you don t want the. Find the probability of pulling a yellow marble from a bag with 3 yellow 2 red 2 green and 1 blue i m assuming marbles.

A a probability tree diagram that shows all the outcomes of the experiment.