(21) A bag contains 5 red balls, 3 green balls, and 2 yellow balls. If you draw one ball at random, what is the probability of getting a red ball or a yellow ball?
- (a) \(\frac{5}{10}\)
- (b) \(\frac{7}{10}\)
- (c) \(\frac{3}{10}\)
- (d) \(\frac{2}{10}\)
(22) A box contains 6 white marbles, 4 black marbles, and 2 gray marbles. If you randomly select two marbles without replacement, what is the probability that both marbles are gray?
- (a) \(\frac{2}{12}\)
- (b) \(\frac{1}{6}\)
- (c) \(\frac{1}{66}\)
- (d) \(\frac{1}{11}\)
(23) In a deck of 52 cards, what is the probability of drawing a face card (jack, queen, or king) at random?
- (a) \(\frac{1}{4}\)
- (b) \(\frac{1}{13}\)
- (c) \(\frac{3}{13}\)
- (d) \(\frac{1}{3}\)
(24) You roll two six-sided dice. What is the probability that the sum of the numbers rolled is 7?
- (a) \(\frac{1}{36}\)
- (b) \(\frac{1}{6}\)
- (c) \(\frac{1}{12}\)
- (d) \(\frac{5}{36}\)
(25) In a bag, there are 8 balls, numbered from 1 to 8. If you draw one ball at random, what is the probability that the number on the ball is a prime number?
- (a) \(\frac{4}{8}\)
- (b) \(\frac{1}{4}\)
- (c) \(\frac{3}{8}\)
- (d) \(\frac{2}{8}\)
