Question 1027268
On her first choice, she has 7 CDs to choose from, and 3 are classical. Therefore, the chance of choosing a classical CD is 3 out of 7.

On her second choice, she has only 6 to choose from, and only 2 are classical. Therefore, the chance of choosing a classical CD is now 2 out of 6, or 1 out of 3.

On her third and final choice, she has only 5 to choose from, and only 1 is a classical CD. Therefore the chance of choosing a classical CD is 1 out of 5.

Now, we multiply all of these together:

{{{ 3/7*1/3*1/5 }}}

and get {{{ 1/35 }}}

She will choose all classical music 1 out of 35 times.