A jar of marbles contains 4 blue marbles, 5 red marbles, 1 green marble, and 2 black marbles.
What is the probability of picking a blue marble, replacing it and then picking a black marble?
4/12 x 2/12 = 8/144 = 1/18
A jar of marbles contains 4 blue marbles, 5 red marbles, 1 green marble, and 2 black marbles.
What is the probability of picking a red marble, NOT replacing it and then picking a green marble?
5/12 x 1/11 = 5/132
A jar of marbles contains 4 blue marbles, 5 red marbles, 1 green marble, and 2 black marbles.
What is the probability of picking a blue marble, NOT replacing it and then picking another blue marble?
4/12 x 3/11 = 12/132 = 1/11
A coin is tossed and a 6-sided die is rolled. What is the probability of getting a head on the coin and a 3 on the die?
1/2 x 1/6 = 1/12
A coin is tossed 5 times. What is the probability of getting a heads 5 times in a row?
1/2 x 1/2 x 1/2 x 1/2 x 1/2 = 1/32