There are three roads from city X to city Y and four roads from city Y to city Z. How many different trips can be made from city X to city Z passing through city Y?

So, exist 12 different trips can be made from city X to city Z passing through city Y.

Step-by-step explanation:

We know that there are three roads from city X to city Y and four roads from city Y to city Z.

So if we chose the first path from  city X to  city Y, then we have 4 more options to go from  city Y to  city Z.

So if we chose the second path from  city X to  city Y, then we have 4 more options to go from  city Y to  city Z.

So if we chose the third path from  city X to  city Y, then we have 4 more options to go from  city Y to  city Z.

We get: 4+4+4=12.

So, exist 12 different trips can be made from city X to city Z passing through city Y.

40 is the final : )

sup

step-by-step explanation: