Thread: Basic Mutually Exclusive Question

I'm stuck on one of my homework problems.

Let A and B be mutually Exclusive events where P(A)=0.3 and P(B)=0.4

a. Find the Probability that both A and B occur.
b. Find the probability that either of A or b occur.
c. Find the probability that B occurs but A does not occur.
d. Find the probability that neither occurs.

For part a I got 0
For part b I got 0.7

I don't know how to figure out part c and d. Can anyone please help?

Originally Posted by reemas

I'm stuck on one of my homework problems.
Let A and B be mutually Exclusive events where P(A)=0.3 and P(B)=0.4
a. Find the Probability that both A and B occur.
b. Find the probability that either of A or b occur.
c. Find the probability that B occurs but A does not occur.
d. Find the probability that neither occurs.
For part a I got 0 CORRECT!
For part b I got 0.7 CORRECT!

c. Find the probability that B occurs but A does not occur.
That is .
But because they are mutually exclusive.

Thanks. That's what I thought and wrote down but was unsure.

For part d is the answer 0? Since one has to occur?

Originally Posted by reemas

For part d is the answer 0? Since one has to occur?

That is incorrect.
Because
That is the complement of part b).