the sum of probability of an event A and event not A is equal to a] 0 b] 1 c] -1 d] 2 plz help///
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answer is b]1
for event x that needs to take place...
p(favourable event for x)+p(nonfavourable event for x)=1
for event x that needs to take place...
p(favourable event for x)+p(nonfavourable event for x)=1
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P(A)+p(A bar ) =1
not A means bar A
not A means bar A
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