Question

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 a green marble?

Answer 1

how many marbles are there?

Answer 2

10

Answer 3

good, and how many are red?

Answer 4

3

Answer 5

great, so the prob of picking a red marble first is:

3/10

that leaves us 9 marbles left. how many that are left are green?

Answer 6

4

Answer 7

thats right, so the prob of picking a green marble next is 4/9

lets multiply the two results

Answer 8

3/10 * 4/9 is. cross multiply?

Answer 9

cross mulitply is a method for something else ... ratios

when you multiply 2 fractions, just go straight across

Answer 10

\[\frac ab \frac xy=\frac{ax}{by}\]

Answer 11

2/15 then. thanks!

Answer 12

your welcome