SOLUTION: Hello can someone please check my work,here is the problem and my answer. Thank you. If P(A or B) = 0.7, P(A) = 0.3 and P(B) = 0.8, determine P(A and B). 0.21

Algebra ->  Probability-and-statistics -> SOLUTION: Hello can someone please check my work,here is the problem and my answer. Thank you. If P(A or B) = 0.7, P(A) = 0.3 and P(B) = 0.8, determine P(A and B). 0.21       Log On


   

Question 364143: Hello can someone please check my work,here is the problem and my answer.
Thank you.
If P(A or B) = 0.7, P(A) = 0.3 and P(B) = 0.8, determine
P(A and B).

0.21
0.56
0.10
0.40
My answer is 56
Answer by SadieKhan(31) About Me  (Show Source):
You can put this solution on YOUR website!
As
P(A and B) = P(A)+P(B)- P(A or B)
=0.8+0.3-0.7
=0.4
Answer is option number 4.
SadieKhan