Suppose you have 3 nickels, 1 quarter, and 1 penny in your pocket. You choose a coin, do not replace it, and then choose a second coin.

Question

Suppose you have 3 nickels, 1 quarter, and 1 penny in your pocket. You choose a coin, do not replace it, and then choose a second coin.

1.What is the probability of randomly picking a penny first, P(penny 1st)?

2.What is the probability of picking a quarter first and a nickel second?

3.What is the probability of picking a nickel second, given that a quarter is picked first?

Answer 1

1 P = 1/5

2 P = (1/5)(3/4)

3 same as 2