With replacement, total pens = 9. Outcomes for colors are RR, RB, RG, BR, BB, BG, GR, GB, GG. The probability of both picking the same color is P(RR) + P(BB) + P(GG) = 9/81 + 16/81 + 4/81 = ...
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When rolling a 6-sided die, sample space is {1, 2, 3, 4, 5, 6}, giving 6 possible outcomes. The even numbers are 2, 4, and 6, so probability is 3/6 = 1/2 = 0.5.
For green sweets, probability is 8 / 30 = 4 / 15 (or approximately 0.267). For yellow sweets, sample probability is 7 / 30. In 600 sweets, the expected yellow sweets count is (7 / 30) x 600 = 140.