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Question

Let A, B, C be three events in a probability space. Suppose that P(A)=0.5, P(B)=0.3, P(C)=0.2,
P(AB)=0.15,P(AC)=0.1 and P(BC)=0.06

The maximum possible value of P(ABC) is,


A
0.31
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B
0.25
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C
0
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D
0.26
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Solution

The correct option is C 0.31
P(AUBUC)=P(A) + P(B) + P(C) − P(A ∩ B) − P(A ∩ C) − P(B ∩ C) + P(A ∩ B ∩ C)

=0.5+0.3+0.2-0.15-0.1-0.06+P(A ∩ B ∩ C)

=0.69+P(A ∩ B ∩ C)

P(A'∩B'∩C')=1-P(AUBUC)

=1-{0.69+P(A ∩ B ∩ C)}

=0.31-P(A ∩ B ∩ C)

which is maximum when P(A ∩ B ∩ C) is zero

Therefore the maximum value of P(A'∩B'∩C')=0.31

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