Help Math
posted by Chrissy .
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?

incorrect.
Law of addition:
P(A or B) = P(A)+ P(B) P(A and B)
source:
http://www.quickmba.com/stats/probability/ 
I got b now thank you