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joel:
The probability of an event A occurs is P(A) = 0.3 The event B is independent of A and P(B) = 0.4.

Calculate P(A or B or both occur).

The answer is 0.58.

I would like to to know how to arrive at this answer.

The question is from Cambridge Advanced Level Mathematics Statistics 1 by Steve Dobbs and Jane Miller, Miscellaneous Exercise 4, Question 2 part (a).

Can someone please explain how to arrive at the answer.   

T.Q:
dont double post

just post in the right place once , and we will see it

holtadit:
I get 0.82

Are you sure 0.58 is the right answer ? Just check again.

joel:
Yes I sure...

astarmathsandphysics:
P(aub)=p(a)+p(b)-p(anb) with p(anb)=p(a)*p(b) cos a and b are independent.

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