Your teacher is looking to purchase TWO activities to use next week. She finds a small
online store called Charlie's Angels. The store
has 28 pixel activities, 18 puzzles, and 11 mazes
for sale. Your teacher thinks they are all fantastic
and has a hard time choosing. She is going to
randomnly select TWO of them for purchase. For
obvious reasons, she does not want to purchase
the same activity twice, so once it is chosen it
does not get put back. Express the probability
that she selects TWO puzzles in lowest terms.