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Last updated at May 29, 2018 by Teachoo
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Example 13 Two dice, one blue and one grey, are thrown at the same time. Write down all the possible outcomes. What is the probability that the sum of the two numbers appearing on the top of the dice is 8? Total number of outcomes = 36 Probability that sum of two numbers is 8 = (๐๐ข๐๐๐๐ ๐๐ ๐๐ข๐ก๐๐๐๐๐ ๐คโ๐๐๐ ๐ ๐ข๐ ๐๐ 8)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐๐ข๐ก๐๐๐๐๐ ) = 5/36 Example 13 (ii) 13? Total number of outcomes = 36 Probability that sum of two numbers is 13 = (๐๐ข๐๐๐๐ ๐๐ ๐๐ข๐ก๐๐๐๐๐ ๐คโ๐๐๐ ๐ ๐ข๐ ๐๐ 13)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐๐ข๐ก๐๐๐๐๐ ) = 0/36 = 0 Example 13 (iii) Less than or equal to 12? Total number of outcomes = 36 Probability that sum of two numbers is less than or equal to 12 = (๐๐ข๐๐๐๐ ๐๐ ๐๐ข๐ก๐๐๐๐๐ ๐คโ๐๐๐ ๐ ๐ข๐ ๐๐ ๐๐๐ ๐ ๐กโ๐๐ ๐๐ ๐๐๐ข๐๐ ๐ก๐ 12)/(๐๐๐ก๐๐ ๐๐ข๐๐๐๐ ๐๐ ๐๐ข๐ก๐๐๐๐๐ ) = 36/36 = 1
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