Question

If A and B are dependent events, which of these conditions must be true?
a. P(A and B) = P(A) + P(B)

b. P(A and B) = P(B)
P(A)
c. P(B|A) = P(B)
d. P(A|B) = P(A)
e. P(B|A) ≠ P(B)

Answer 1

a bunch of them

Answer 2

the definition is this
A and B are independent if \[P(A|B)=P(A)\]
the left hand side of the equal sign is \[\frac{P(A\cap B)}{P(B)}\]so it also says \[\frac{P(A\cap B)}{P(B)}=P(A)\]

Answer 3

you can change this equality around using algebra

Answer 4

so D.?

Answer 5

not only. satellite73 gave a hint.

Answer 6

oh ok