I am studying Discrete Math Structure, currently the topic is on Set Operations.
One of the HW questions is:
If c(A) = 16, c(B) = 29, and c(A intersect B) = 9, then... c (A Union B) is = ______?
What is c? I don't understand the notation c(A) :(
I can't find c(A) notation in my textbook :/

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think of it like this ...set A has 16 elements, set B has 29 elements and 9 of them are in both set.

and c is the count of each set

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