Probability 2 Question 1
1. For three events and , if (exactly one of or occurs (exactly one of or occurs (exactly one of or occurs and (all the three events occur simultaneously) , then the probability that atleast one of the events occurs, is
(a)
(b)
(c)
(d)
(2017 Main)
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Answer:
Correct Answer: 1. (b)
Solution:
- We have,
(exactly one of or occurs)
According to the question,
and
On adding Eqs. (i), (ii) and (iii), we get