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An experiment consists of rolling two fair number cubes. What is the probability that the sum of the two numbers will
be 8? Express your answer as a fraction in simplest form.
Probability of an event happening = Number of ways it can happen / Total number of outcomes ; 2 + 6 = 8; {2,6} 3 + 5 = 8 ; {3,5} 4 + 4 = 8 ; {4,4} 5 + 3 = 8 ; {5,3} 6 + 2 = 8 ; {6,2} There are 5 number of ways it can can happen; {1,1} {1,2} {1,3} {1,4} ... {6,3} {6,4} {6,5} {6,6} There are 36 number of outcomes; The probability is 5 / 36 = 0.138
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