http://www.ck12.org Chapter 1. Independent and Dependent Events
What if we said that we were choosing a card from a deck of cards? Suppose eventAis choosing an eight and event
Bis choosing an Ace.
Notice that the sets containing the possible outcomes of the events have no elements in common. Therefore, the
events are mutually exclusive.
Example A
What is the probability of randomly picking a number from 1 to 10 that is even or randomly picking a number from
1 to 10 that is odd?
To calculate the probability of picking a number from 1 to 10 that is even or picking a number from 1 to 10 that is
odd, you would follow the steps below:
A={ 2 , 4 , 6 , 8 , 10 }
P(A) =
5
10
B={ 1 , 3 , 5 , 7 , 9 }
P(B) =
5
10
P(AorB) =5
10
+
5
10
P(AorB) =10
10
P(AorB) = 1