Posted by **Anonymous** on Monday, August 25, 2014 at 8:05pm.

A game has a box containing four marbles - three red and one green. The player draws one marble at a time without replacement until the green marble is drawn. After that, the game is over.

The game ends in four different ways. What is the probability of drawing a green marble for each of these possible outcomes?

- Math -
**Damon**, Monday, August 25, 2014 at 8:14pm
green on first try = 1/4

green on second try:

red first = 3/4

then green = 1/3

so

3/4 * 1/3 = 1/4

green on third try

red first = 3/4

red second = 2/3

green third = 1/2

3/4 * 2/3 * 1/2 = 1/4

green o fourth try

red first = 3/4

red second = 2/3

red third = 1/2

green fourth = 1/1

would you believe 1/4 again :)

- Math - Probability -
**Anonymous**, Wednesday, August 27, 2014 at 6:56am
There is a shooting game that consists of 10 targets. The player must use a bow to hit all the targets in order to win a prize. What is the probability of hitting all 10 targets if the player has 15 arrows?

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