Question

A bag contains 4 red marbles, 3 blue marbles and 6 green marbles. If two marbles are

drawn out of the bag, what is the probability, to the nearest 1000th, that both
marbles drawn will be red?

Answer 1

~0.143

Explanation:

So, in total there are 15 marbles, and only 6 of them are red. So the first draw will have a chance of being red. Since you didn't mention placing it back, the next draw will have a chance of being red. It's , because you just took a red one out of the bag (leaving 5 left) and the total was lessened by one. To get the answer, you'd multiply both numbers together.

6/15 x 5/14 = 1/7 or (roughly) 0.143