Answer:

Explanation:
Given:
- 3 green marbles
- 4 blue marbles
- 2 red marbles
- 1 yellow marble
Total number of marbles = 3 + 4 + 2 + 1 = 10

Probability of selecting a green marble on first pick:

Probability of selecting a green marble on second pick:

(as the 1st pick was replaced)
Therefore,
