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If P(A) + P(B) = 1, does it follow that either event A or event B must occur?

If P(A) + P(B) = 1, does it follow that either event A or event B must occur?

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2 Answers

Mir Noaman Ali IIT-Roorkee
57 Points
10 years ago

NO IT IS NOT NECESSARY

Ritvik Gautam
85 Points
10 years ago

No it does not mean that either or the event must occur.

for exaple... p(a) could be 0.. in that case too... P(a) + P(b) = 1

 

 

 

 

 

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