Problem with solving a Probability problem

fendi · 28 Oct 2013 at 14:04

Hi dudes,

I need to work out a probability outcome of a scenario:

I have 300 balls, 290 different and 10 red. I have two chance of picking the red balls, with an extra bonus chance if I can't find two. so it will be either 2 chances if I get both right, or 3 if I only get 1 right in the first 2.

Please please help as my math sucks.

Thanks a lot every one.

fendi · 28 Oct 2013 at 14:08

No, The 290 balls are the same colour, but not red. There are only 10 red balls in the batch

fendi · 28 Oct 2013 at 14:09

No replacement balls BTW

fendi · 28 Oct 2013 at 14:22

Theophany said:
Assuming 0.9r=1, then you'll find that the aeroplane on the treadmill will remain stationary, the goat will eat grass in in the radius of the pole to which it is tied and even after opening the first door, you still have a 1/3 chance of picking the Cadillac from the remaining two doors.

Then all you need to do is take that answer and divide it by 0. Bob's your uncle, Fanny's your aunt.

Also, based on how I read what you wrote, your answer seems correct to me.

Does this take into account variable change if I switch from first door to the second?