Chris P. Cream bought a box of chocolates, but only likes the kind filled with caramel.
Chris will grab a chocolate from the box, bite into it, then will either finish it, or
throw it away and grab a new one.
If the box of chocolates has 9 caramels, 6 raspberry, 8 nougat and 4 cream, what is
the probability that Chris throws away the first chocolate, but gets to eat the
second?