A standard six-sided die is rolled twice. What is the probability that the product of the rolls is 1, 2, or 3?     
  
 The number ways can you get a 1, 2, or 3 out of the number of ways the two rolls could have resulted.     
  
 number of ways to get  1 ... 1, 1                   only 1 way     
 number of ways to get  2 ... 1, 2   2, 1                  2 ways     
 number of ways to get  3 ... 1, 3   3, 1                  2 ways     
  
 total number of ways to get a desired product      5 ways     
 total number of ways rolls could have landed     36 ways     
  
 probability of rolling the desired product              5 / 36 or 13.9% if you prefer stating it that way     
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