2) In a design of a casing for gears housing we have 4 different types of fasters, 3 different bolt length and 3 different bolt locations. How many possible designs are there? 3) A driver from city A can be directly reach city B using 4 different roads, Moreover, he can also reach city B by passing by city C, he has 3 different roads from A to C, then 5 different roads from C to B. How many different choices are available?
