Probability of Drawing a Red or Green Marble

A bag contains 3 red, 5 blue, and 2 green marbles. If one marble is drawn at random from the bag, what is the probability that the marble drawn is either red or green?

To solve this problem, you first need to determine the total number of marbles in the bag. Then, calculate the number of favorable outcomes (red and green marbles) and use the probability formula:

$P(E) = \f\frac{\text{Number of favorable outcomes}}{\text{Total outcomes}}$