Consider the following in respect of two events A and B: 1. P (A occurs but not B) =P(A)−P(B) if B ⊂ A 2. P (A alone or B alone occurs) =P(A)+P(B)−P(A\capB) 3.P(A\cupB)=P(A)+P(B) if A and B are mutually exclusive Which of the above is/ are correct? [NDA I 2018]

Correct Answer is : 1 and 3 only

UPSC NDA I 2018 Mathematics Solved Paper

Question : 118 of 120

Marks: +1, -0

Consider the following in respect of two events A and B:
1. P (A occurs but not B) =P(A)−P(B) if B ⊂ A
2. P (A alone or B alone occurs) =P(A)+P(B)−P(A∩B)
3.P(A∪B)=P(A)+P(B) if A and B are mutually exclusive
Which of the above is/ are correct?

[NDA I 2018]

1 only
1 and 3 only
2 and 3 only
1 and 2 only

Validate

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