Question

If P(A)= 0.7, P(B)= 0.4, P(A or B)= 0.8, What is P(A and B)?
A) .3
B) .4
C) .5
D) .8
E) .6

Answer 1

\[P(A \cup B)=P(A)+P(B)-P(A \cap B) \]

Solve for \(P(A \cap B)\)

Answer 2

or = \(\cup\)
and = \(\cap\)