A standard die is rolled. P (A) = the probability of rolling a three

P (B) = the probability of rolling a even number

What is P (A or B)

To find the probability of A or B, add the two probabilities (since they are mutually exclusive).

P (A) = 1/6 since 3 is one possibility out of 6

P (B) = 1/2 since there are 3 numbers that mke this true out of 6 and 3/6 = 1/2

P (A or B) = 1/6+1/2

P (A or B) = 2/3

Final answer: 2/3