You draw one card from a standard deck.

(a) What is the probability of selecting a king or a queen?

(b) What is the probability of selecting a face card or a 10?

(c) What is the probability of selecting a spade or a heart?

(d) What is the probability of selecting a red card or a black card?

A bag contains 7 white counters, 5 black counters, and 8 green counters. What is the probability of drawing

(a) a white counter or a green counter?

(b) a black counter or a green counter?

(c) not a green counter?

Aaron buys a bag of cookies that contains 7 chocolate chip cookies, 4 peanut butter cookies, 9 sugar cookies and 5 oatmeal cookies.

What is the probability that Aaron reaches in the bag and randomly selects an oatmeal cookie from the bag, eats it, then reaches back in the bag and randomly selects a chocolate chip cookie?