You have 2 red marbles, 4 green and 2 blue marbles. What is the probability of pulling a red marble and then replacing the first marble and then grabbing a green marble?

1/8.

Step-by-step explanation:

There are a total of 8 marbles.

Probability of first drawing a red marble = 2/8 = 1/4.

Probability of drawing a green marble = 4/8 = 1/2.

So the probability of Red then Green = 1/4 * 1/2

= 1/8 (answer).

The probabilities are multiplied because the 2 events are independent.