Activity I: LET'S SOLVE THIS! Find the number of three-digit numbers that can be written using the digits from the set {1, 3, 5}, assuming repeated digits are not allowed.
Answer: 6 (135, 153, 315, 351, 513, 531)
A box contains 3 balls: red, white, and blue, respectively. If they are identical except for color, what is the probability of drawing a red ball on the second draw?
Draw your first diagram here.