Suppose there are three cards: a black card that is black on both sides,
a white card that is white on both sides, and a mixed card that is black on one side and white on the other.
All the cards are placed into a hat and one is pulled at random
and placed on a table.
The side facing up is black.

What are the odds that the other side is also black?

I just noticed that this is the same problem as Fifty-Fifty?, except that this one asks for the probability that the two sides match and that one asks for the probability that they are different.

Posted by Steve Herman on 2017-06-14 09:06:02