set and probability notation

what is ξ

the universal set

wht is A

Set A

What is A'

Not in set A

What is B

Set B

What is B'

Not in set B

What is A∩B

A and B (the intersection)

What is (A∩B)'

Not A and B

What is A∪B

A or B

What is (A∪B)'

Not a or B

P(A)

The probability of event A happening

P(A')

The probability of event A not happening

p(A∩B)

The probability of A and B happening at the same time

p(A∩B')

The probability of A happening but B NOT happening

p(A∪B)

The probability of A or B happening

p(A'∪B)

The probability of A NOT happening or B happening

P(B|A)

Event B given Event A