Problem-
Three different types of monthly computer passes are offered by a city's local transit authority for three different groups of passengers. How many different kinds of passes must be possible?
a. 9 possible passes
b. 18 possible passes
c. 15 possible passes
d. 6 possible passes
e. 12 possible passes
f. 11 possible passes
Additional Information-
The problem belongs to Mathematics and it is explain about finding the different kinds of passes issued by the city's local transit authority.