Intersection of Events

The intersection A ∩ B is the event "A and B both happen". It contains outcomes that are in both A and B.

If A = {2, 4, 6} (even) and B = {3, 6} (multiple of 3), then A ∩ B = {6}.

Only 6 satisfies both conditions. P(A ∩ B) = 1/6 when rolling a die.