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Joint Probability

Joint probability is the probability of two events happening together.

The two events are usually designated event A and event B. In probability terminology, it can be written as:

$P(A \cap B) =P(A,B) = P(A|B)*P(B)$

Anyway, if an event A and B are idenpendent then

$P(A|B) = P(A)$

, and therefore, $P(A \cap B) = P(A,B)$

become $P(A) * P(B)$

2/52 = 1/26
(There are two black fives in a deck of 52 cards, the five of spades and the five of clubs).

OR Events

$P(A \cup B) = P(A)+P(B)-P(A \cap B)$

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