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Byju's Answer
Standard X
Mathematics
Complementary Event
What is the p...
Question
What is the probability of an event E not happening if P(E) = 0.2?
A
0.2
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B
0.8
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C
0.3
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D
0.6
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Solution
The correct option is
B
0.8
We know that, sum of probabilities of complementary events = 1
i.e.,P(E) + P(not E) = 1
Here, given that p(E) = 0.2
⇒
P(not E) = 1 - P(E)
= 1 - 0.2
= 0.8
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