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I thought that it would be (11 - 5) + (12 - 5) = 13

Can you see the math symbols? I think because I can't =/

If they aren't disjoint, your solution of 13 sounds right.

Yeah, but the number signs aren't working.

sorry

Is this equality right?
\( \#A\cap(B\cap C) = \#A + \# (B\cap C) \)

This is so confusing =/

is there information given about which sets are disjoint?

|dw:1356902619299:dw|

Yep, that's very convincing! Good job!