Question

Of 12 books, 3 are fiction
I think 3/12 or 1/4

Two of 6CD's are scratched
2/6 or 1/3

Nine out of 10 teens like to shop
I think 9/10

Answer 1

I tried to tell you, you must give the whole question.
do you want probability of scratched CD or unscratched CD?
for example
1/4 ARE Fiction
but
3/4 are NON-Fiction
You did not say which you wanted.

Answer 2

All the problem said was

Two of 6 CD's are scratched.

It wants me to take the probability and write it as a fraction