Finding probabilities through general addition rule 1. The problem statement, all variables and given/known data http://postimg.org/image/q9ztktpot/ [Broken] 2. Relevant equations P(A or B)=P(A)+P(B)-P(A and B) P(A and B)=P(A)P(B) 3. The attempt at a solution The question is for part b). It said it was only focused on the mens so i ignored all the other numbers. I used the general addition rule where P(A or B)=P(A)+P(B)-P(A and B). Since these events are independent, i used this equation... P(A and B)=P(A)P(B). I found P(A) from 400/2000= 0.2 I found P(B) from 500/2000=0.25. Then i found P(A and B)=P(A)P(B)=0.05 Now i plugged it into the general addition rule... P(A or B)=0.2+0.25-0.05=0.4 but it was wrong. What did i do wrong?