Question

P(A)=0.40
P(B)=0.25
The probability of both events occurring is 0.15. What is the probability of either event occurring?

A. 0.15
B. 0.50
C. 0.65
D. 0.80

Is it D?

Answer 1

incorrect.

Law of addition:

P(A or B) = P(A)+ P(B)- P(A and B)

source:
http://www.quickmba.com/stats/probability/

Answer 2

I got b now thank you