Question

What must be true for P (A and B) = P (A) * P (B)?

Answer 1

When events A and B are independent of each other

Answer 2

these are the choices

Answer 3

A. A and B cannot be disjoint. B. A and B must be independent. C. A and B cannot be independent. D. A and B must be disjoint. E. It is always true.

Answer 4

so would it be B?

Answer 5

Yes

Answer 6

okay thanks wanna help me with another

Answer 7

I can try.

Answer 8

what must be true in order for P(A orB) = P(A) + P(B)

Answer 9

same choices as the previous one

Answer 10

No. https://people.richland.edu/james/lecture/m170/ch05-rul.html

Answer 11

It's true when events are mutually exclusive

Answer 12

Or disjoint

Answer 13

so A or B must be disjoint?

Answer 14

Yeah

Answer 15

okay thanks!!