I'm having some trouble figuring out how to find the cardinality of some sets. I've figured some of the problems out, but some I can't get.
Suppose |A| = 24, |B| = 21, |A U B| = 37, |A intersect C| = 11, |B-C| = 10, and |C-B| = 12. Find
A) |A intersect B|
D) |B U C|
For A), I came up with 8, for C) I came up with 13 ( is |B-A| = |A U B| - |A|?) and I have no idea how to start D).