Lotto Probability

[BillyJoe]

I was responding to the following scenario...

Before any card is chosen, you would expect the probability to be 1/2 -- that the other side of the card you choose, will be blue.

So, before any card is chosen, what is the probability that the the other side of the card that you choose will be blue?

There is a blue/blue card and a blue/red card.
Therefore, when you choose one...
- there are 4 faces you could be looking at: blue, blue, blue, and red
- the other sides of these four faces are: blue, blue, red, and blue
Three of these four are blue

Hence the probability is 3/4.

 

[Just thinking]

I agree with this as well ... and note that it is different than post 559.