Problems Involving And & Or

                     Lesson 1

Problem:                   What is probability of getting number 4 or 5 when dice numbered from 1 to 6 is rolled?

Step 1: Probability of rolling 4, P (A) = 1/6

Step 2: Probability of rolling 5, P (B) = 1/6

Step 3: Probability of drawing 4 or 5 = P (A) + P (B) – P (A and B)  

= 1/6 + 1/6 – 0

                                                                                                                       = 2/6 = 1/3

 Step 4:                    The answer is:  1/3

 Complete   

                                                            Try two practice problems:  

Do the following:                                                                                          

A.	P (King of Diamond in a deck of cards)
B.	P (Jack of spades or red Ace in a deck of cards)

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