In a bag containing 5 blue marbles, 3 green marbles, and 2 red marbles, what is the probability of randomly picking a green marble? Write answer as fraction in simplest form.

The total number of marbles in the bag is 5 + 3 + 2 = 10.

The number of green marbles is 3.

Therefore, the probability of randomly picking a green marble is 3/10.