Question:
An ordinary $6$-sided die has a number on each face from $1$ to $6$ (each number appears on one face). How many ways can I paint two faces of a die blue, so that the product of the numbers on the painted faces isn't equal to $6$?

Answer:
First, let's ignore the requirement that the product can't be $6$. Then I can pick the first blue face in $6$ ways, and the second blue face in $5$ ways, making $6\cdot 5 = 30$ choices in all. But we've actually counted each possible result twice, because it makes no difference which of the two blue faces I chose first and which I chose second. So the number of different pairs of faces is really $(6\cdot 5)/2$, or $15$.

Now we exclude the pairs which have a product of $6$. There are two such pairs: $\{1,6\}$ and $\{2,3\}$. That leaves me $\boxed{13}$ pairs of faces I can paint blue.