Use the definition of the complement of an event to find the given probability.
1. Find the probability of not drawing a diamond when a single card is drawn at random from a well-shuffled standard deck of 52 playing cards.
2. A single marble is drawn at random from an urn containing 7 black marbles, 6 green marbles, and 10 red marbles. (Assume the marbles are identical except for color.) What is the probability that the marble drawn is not red?