You reach into a bag of coins and withdraw two coins. What is the probability you a nickel and then a dime if the bag held five pennies, ten nickels, and four dimes?
There are 19 coins (5 pennies, 10 nickels, and 4 dimes).
You withdraw one coin and it is a nickel (
You withdraw another one and it is a dime (
The probability of this outcome is:
If you put the coin back after the first withdraw, the probability is different: