🧠 Quick Memory Anchors
Core Keywords to Remember
UNION = OR
A ∪ B includes ALL elements in A or B
INTERSECT = AND
A ∩ B — only SHARED elements
COMPLEMENT = NOT
A′ means everything NOT in A
MUTUALLY EXCLUSIVE
P(A ∩ B) = 0 — can't happen together
INDEPENDENT
P(A|B) = P(A) — one doesn't affect other
COMBINATION nCr
Order doesn't matter — "Choose" r from n
📐 20 Practice Questions