To answer a probability all you do is make a fraction with the number of
SUCCESSFUL cases on top and the number of POSSIBLE cases on the bottom.
A bag contains 9 pink marbles, 6 green marbles and 14 brown marbles. What is the chance of drawing a pink marble?
9 pink SUCCESSFUL marbles out of (9+6+14) or 29 POSSIBLE marbles.
So that's a probability of
If a pink marble is drawn then placed back into the bag, and a second marble is drawn, what is the probability of drawing a green marble?
Drawing a pink marble and placing it right back has no effect whsoever.
So ignore that.
6 SUCCESSFUL green marbles out of (9+6+14) or 29 POSSIBLE marbles.
That's a probability of
Edwin