Question 266624
<pre>
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.
</pre>

A bag contains 9 pink marbles, 6 green marbles and 14 brown marbles.  What is the chance of drawing a pink marble?  
<pre>
9 pink SUCCESSFUL marbles out of (9+6+14) or 29 POSSIBLE marbles.

So that's a probability of {{{9/29}}}

</pre>
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?  
<pre>
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 {{{6/29}}}

Edwin</pre>