Please explain these questions in detail. Thanks

Each morning, Noor grabs a mug from her cabinet for coffee during the day. She has 9 mugs in total: 3 each of the colors green, black, and white. Each morning, Noor picks one mug at random from all 9 mugs regardless of the mugs she picks on other days. In each question below, pick the correct answer. (a) The weekend (Saturday and Sunday) is coming up. What is the chance that Noor picks a green mug on both those days?

(b) Noor brings her mug to each Data 8 lecture. Next week, Data 8 lectures will be on Monday, Wednesday, and Friday. What is the chance that Noor brings a black mug to at least one of the three lectures?

(c) One of Noor's classes has online office hours in the morning. She will attend the office hours on Tuesday and Thursday next week, bringing her mug with her. What is the chance that the mugs she has on those two days are the same color?