SOLUTION: Four commuter trains and five express buses depart from city A to City B in the morning, and three commuter trains and four express buses operate on the return trip in the evening.

Algebra ->  Probability-and-statistics -> SOLUTION: Four commuter trains and five express buses depart from city A to City B in the morning, and three commuter trains and four express buses operate on the return trip in the evening.      Log On


   

Question 674007: Four commuter trains and five express buses depart from city A to City B in the morning, and three commuter trains and four express buses operate on the return trip in the evening. In how many ways can a commuter from City A to City B complete a daily round trip via bus and/or train?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Four commuter trains and five express buses depart from city A to City B in the morning, and three commuter trains and four express buses operate on the return trip in the evening. In how many ways can a commuter from City A to City B complete a daily round trip via bus and/or train?
---
The commuter can go from A to B in 9 ways,
and can go from B to A in 7 ways.
----
# of ways to make the roundtrip = 9*7 = 63
==================
cheers,
Stan H.
=====================