Question 1174700
<pre>

{{{matrix(1,3,

probability,""="",matrix(1,4,number,of,SUCCESSFUL,ways)/matrix(1,4,number,of,POSSIBLE,ways))}}}

Here is a list of all eight possible ways to select the items:

<u>      first        second       third  </u>  
1.    good         good         good   
2.    good         good       defective
<font color="red"><b>3.    good       defective      good</b></font>   
4.    good       defective    defective
5.  defective      good         good   
6.  defective      good       defective
7.  defective    defective      good   
8.  defective    defective    defective

Notice that there was only 1 successful way, number 3, which is in red.

That's 1 successful way out of 8 possible ways, so the probability is

1 out of 8, so we make that into a fraction 1/8.

Answer: 1/8

Edwin</pre>