There are four roads from city A to city B. There are five roads from city B to city C. How many different routes can we take from city A to city C via city B?

n =  20

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## Related math problems and questions: If there are 3 roads from town A to town B And 4 roads from town B to town C, in how many ways can one go from town A to town C and back to town A, through town B, without passing through the same road twice?
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