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10 January, 09:01

What is wrong with the expression upper p left parenthesis upper a right parenthesis plus upper p left parenthesis upper a overbar right parenthesis equals 0.5p (a) + pa=0.5 ?

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  1. 10 January, 12:50
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    P (A) is the probability of happening A

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    P (A) is the probability of not happening A.

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    Evidently, A and A represents the total universe: either A happens or A not happens.

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    So, P (A) + P (A) has to be 1, not 0.5.
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