Need math help: how many different kinds of passes?

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Three different types of monthly commuter 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.
B.
C.
D.
E.
F.
Nov 15th, 2015

Thank you for the opportunity to help you with your question!

So every group of passengers may have 3 different types of passes 

In that case 3 types for group 1 + 3 3 types for group 2 + 3 types for group 3 = 9 types of passes

Answer is A

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Nov 15th, 2015

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Nov 15th, 2015
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