A bag contains 6 blue marbles, 4 red marbles, and 5 green marbles. If two marbles are drawn at random without replacement, what is the probability that both are green?
2/21
20
If a coin is flipped three times, what is the probability of getting exactly two heads?
3/8
15
20% of 800
160
10
80% of 540
432
15
If you flip a coin, what is the probability of getting tails?
1/2
5
A six-sided die is rolled. What is the probability of rolling a number smaller than 5?
2/3
5
A jar contains 8 red marbles, 6 blue marbles, and 6 green marbles. If you pick one marble at random, what is the probability of picking a red marble?
2/5
10
If you pick a random number between 1 and 10 (inclusive), what is the probability of picking a prime number?