If A and B are independent events such that Pr(A∩B) = 0.13 and Pr(B) =0.32, then, correct to four decimal places, Pr(A∪B) is equal to:
a)0.2163
b)0.0416
c)0.4063
d)0.45
e)cannot be determined

Question

If A and B are independent events such that Pr(A∩B) = 0.13 and Pr(B) =0.32, then, correct to four decimal places, Pr(A∪B) is equal to:
a)0.2163
b)0.0416
c)0.4063
d)0.45
e)cannot be determined

anonymous · Answer

i've forgotten this topic completely...but i just want to write a formula :
$$P(A \cup B)=P(A)+P(B)-P(A∩ B)$$ is that right?

anonymous · Answer

yes.

anonymous · Answer

what to do now? we dont have the value of $P(A)$

anonymous · Answer

|dw:1344243946329:dw|Also for an independent event