You have a 4-card deck containing a queen, a jack, a 10, and a 9. You draw a random card, then put it back and draw a second random card. Use a tree diagram to calculate the probability that you draw exactly 1 "numbered" card (a 9 or a 10).

Question

anonymous · Answer

I can't make a tree, but you would have 4 initial branches (one to each card), and each "card branch" would branch out to all the four cards.

Your total amount of choices is 16, and out of those, 8 work, so the probability is 1/2