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castortr0y [4]
3 years ago
8

What is wrong with the expression upper p left parenthesis upper a right parenthesis plus upper p left parenthesis upper a overb

ar right parenthesis equals 0.5p(a)+pa=0.5​?
Mathematics
1 answer:
VikaD [51]3 years ago
7 0
P(A) is the probability of happening A
    __
P( A ) is the probability of not happening A.
                          __
Evidently, A and A represents the total universe: either A happens or A not happens.
                      __
So, P(A) + P( A ) has to be 1, not 0.5.
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They also tell you that A, B, C, and D are consecutive numbers. Meaning that they are right next to each other so like 1, 2, 3, and 4.

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