Inclusion–exclusion for three sets (Add singles, subtract pairwise overlaps, add triple overlap back)
jee-mainjee-advanced
Add singles, subtract pairwise overlaps, add triple overlap back
What each symbol means
| Symbol | What it stands for |
|---|---|
| triple | |A∩B∩C| |
| pairwise | |A∩B|, |B∩C|, |C∩A| |
| |A|,|B|,|C| | Sizes |
When to use this
A, B, C finite; standard IE bookkeeping.