Suppose Ruth Ann has 5 routes she can choose from to get from school to
the library, and 6 routes from the library to her home. How many routes
are there from Ruth Ann’s school to her home with a stop at the library?
This is a straightforward counting problem.
Just multiply the options. There are 5 routes she can take from her school to the library, and 6 possible routes from the library to her home.
Therefore, 5 x 6 = 30 possible routes choice b.
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