Replace, which means putting it back in place.

1. Obviously, p = 1 2 of1purple marbles.

1 p = 3/ 12 for red marbles.

They are independent. p = p 1 * P2 = 1/ 12 * 3/ 12 = 1/48

2. 1 p = 3/ 12 for green marble

1 p of green marble = 3/12

They are independent. p = p 1 * P2 = 3/ 12 * 3/ 12 = 1/ 16

3. 1 p =112 for purple marble

1 p of green marble = 3/12

They are independent events. p = p 1 * P2 = 1/ 12 * 3/ 12 = 1/48

That's what I was thinking, too. ...