SOLUTION: a bag contains 3 red and 6 yellow marbles. Two marbles are drawn without replacement. Determine the probability of picking two red marbles.
Algebra ->
Probability-and-statistics
-> SOLUTION: a bag contains 3 red and 6 yellow marbles. Two marbles are drawn without replacement. Determine the probability of picking two red marbles.
Log On
Question 1039848: a bag contains 3 red and 6 yellow marbles. Two marbles are drawn without replacement. Determine the probability of picking two red marbles. Answer by macston(5194) (Show Source):
You can put this solution on YOUR website! .
There are 9 total marbles.
.
The probability of picking a red first is 3/9 (or 1/3).
.
This leaves 8 marbles with 2 red marbles.
.
The probability of choosing a red marble second after a red first is 2/8 (or 1/4).
.
The probability of picking two reds is
.
