Number 1

Which are always true?

* P(SUT)=P(S)+P(T)

If S is a subset of T, P(SUT)=P(S)

P(not S)=100%-P(S)

* If S is a subset of T, P(ST)=P(S)

* If S is a subset of T, P(SUT)=P(T)

Number 2

T implies not S. Which are always true?

not S is a subset of T

not T is a subset of S

* S and T are mutually exclusive

*S and T are independent

*not T is a subset of not S

Number 3

P(S) = 90% and P(T) = 55%

Which are always true?

*P(ST)>=45%

P(SUT)>=95%

*T cannot imply S

S and T cannot be mutually exclusive

P(SUT)>=90%

* = ones I think are true

>>>>Can somebody explain which ones I got wrong? <<<