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7–4BUILD YOUR VOCABULARY (pages 169–170)Complementary events are two events in which either oneor the other must happen, but they cannot happen at thesame time. The sum of the probability of an event and itscomplement is or .EXAMPLE Find Probability of the ComplementUse the spinner from Example 1. Find the probability ofnot landing on 6.The probability of not landing on 6 and the probability oflanding on 6 are. So, the sum of theprobabilities is .P(6) + P(not 6) = 1+ P(not 6) = 1 Replace P(6) with .1_6 + = 1 THINK 1_ plus what number equals 1?6HOMEWORKASSIGNMENTPage(s):Exercises:So, the probability of not landing on 6 is .Check Your Progress A number cube is rolled.a. Find the probability of rolling a 4.b. Find the probability of rolling a number greater than 3.c. Find the probability of not rolling an even number.Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.180 Math Connects, Course 1