Given that P(A or B) = 1, P(A) = 1, and P(A and B) = 1, find P(B).

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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Hi,

Could you please help me understand how you came to a fraction answer for this question? Thank you.

Given that P(A or B) = 1, P(A) = 1, and P(A and B) = 1, find P(B).
Transcribed Image Text:Given that P(A or B) = 1, P(A) = 1, and P(A and B) = 1, find P(B).
Expert Solution
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GivenP(A or B)=13P(A)=14P(A and B)=18

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Follow-up Question

I see..we need to minus the 1/4 because it represents A and we are looking for B.

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Follow-up Question

You are literally taking 1/3 and changing it to 13

1/4= 14 and 1/8= 18?

So it's P(b)+ p (A or B) - p (A)?

Why do you change the fractions the way you did, could you please help me understand this portion.

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