- Joined
- Jun 30, 2005
- Messages
- 2,780
- Reaction score
- 2
There are 3 blue, 4 green, 5 red balls. What is the probability of drawing a blue, a green and a red ball without replacement?
I thought answer should be 1/22 becuz
3/12 x 4/11 x 5/10 = 1/22 but that's not it.
The solution says I should multiply it by 6 but i don't know why.
Here is a similar question
Superwoman has 3 blue balloons, 4 green balloons and 5 red balloons. How many possible 3 balloon bouquets can she make?
Again, i thought it should be 1/22 but no.
This is actually different from previous one.
The previous one multiplied by 6, but this time we divide by 6
Basically I wanna know
when I should multiply and when I need to divide.
and also, when I don't have to do any of those two and just leave the answer 1/22.
I thought answer should be 1/22 becuz
3/12 x 4/11 x 5/10 = 1/22 but that's not it.
The solution says I should multiply it by 6 but i don't know why.
Here is a similar question
Superwoman has 3 blue balloons, 4 green balloons and 5 red balloons. How many possible 3 balloon bouquets can she make?
Again, i thought it should be 1/22 but no.
This is actually different from previous one.
The previous one multiplied by 6, but this time we divide by 6
Basically I wanna know
when I should multiply and when I need to divide.
and also, when I don't have to do any of those two and just leave the answer 1/22.