How come the answer comes 48 here? Help me

[AliCyborg]

when i did I got 40,but the answer comes 48 please explain me.

 

[Deleted member 4993]

when i did I got 40,but the answer comes 48 please explain me.

How did you get 40 - please share your work/thoughts.

 

[JeffM]

How does the problem say to calculate the cardinality?

 

[Steven G]

Since the method on how to answer this question was given I will show you how they got 48. 3*4*4=48