# Ball-bags

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• Feb 7th 2009, 07:53 AM
Obsidantion
Ball-bags
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

I have a bag of three balls. One of them is green and the others are either red or green. If I select one ball at random, what is the chance that it will be red?

OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
• Feb 7th 2009, 08:04 AM
Mush
Quote:

Originally Posted by Obsidantion
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

I have a bag of three balls. One of them is green and the others are either red or green. If I select one ball at random, what is the chance that it will be red?

OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

I don't know, but I suggest you take a trip to your Doctor. It could be serious.
• Feb 9th 2009, 12:04 PM
Greengoblin
Quote:

Originally Posted by Mush
I don't know, but I suggest you take a trip to your Doctor. It could be serious.

haha good advice (Giggle)
• Feb 9th 2009, 05:29 PM
mr fantastic
Quote:

Originally Posted by Obsidantion
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

I have a bag of three balls. One of them is green and the others are either red or green. If I select one ball at random, what is the chance that it will be red?

OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO

I will assume you're not color blind.

Calculate the probability that your bag looks like each of the following:

O O O

O O O

O O O

Then calculate the probability of getting a O from each of those bags.

For each bag calculate (probability of bag)(probability of O from that bag). Add the results.