Hello, ciccio!
We have a box containing 50 balls of which 6 are black and the rest red.
Without seeing the balls we take 23 balls out of the box.
What is the probability that 6 of these 23 balls are black?
There are 50 balls. We take 23 of them.
. . There are: . possible outcomes.
There are 6 black balls. We want 6 of them.
. . There is: . way.
There are 44 red balls, and we want 17 of them.
. . There are: . ways.
Hence, there are: . ways to draw 6 black balls.
Therefore: .
I think it comes out to: .