Check whether the following probabilities P(A) and P(B) are consistent

1.	Check whether the following probabilities P(A) and P(B) are consistently defined(i) P(A) = 0.5, P(B) = 0.7, P(A ∩ B) = 0.6(ii) P(A) = 0.5, P(B) = 0.4, P(A ∪ B) = 0.8
Answer» (i) P(A) = 0.5, P(B) = 0.7, P(A ∩ B) = 0.6 It is known that if E and F are two events such that E ⊂ F, then P(E) ≤ P(F). However, here, P(A ∩ B) > P(A). Hence, P(A) and P(B) are not consistently defined. (ii) P(A) = 0.5, P(B) = 0.4, P(A ∪ B) = 0.8 It is known that if E and F are two events such that E ⊂ F, then P(E) ≤ P(F). Here, it is seen that P(A ∪ B) > P(A) and P(A ∪ B) > P(B). Hence, P(A) and P(B) are consistently defined.

Check whether the following probabilities P(A) and P(B) are consistently defined(i) P(A) = 0.5, P(B) = 0.7, P(A ∩ B) = 0.6(ii) P(A) = 0.5, P(B) = 0.4, P(A ∪ B) = 0.8

Answer»

(i) P(A) = 0.5, P(B) = 0.7, P(A ∩ B) = 0.6
It is known that if E and F are two events such that E ⊂ F, then P(E) ≤ P(F).
However, here, P(A ∩ B) > P(A).
Hence, P(A) and P(B) are not consistently defined.
(ii) P(A) = 0.5, P(B) = 0.4, P(A ∪ B) = 0.8
It is known that if E and F are two events such that E ⊂ F, then P(E) ≤ P(F).
Here, it is seen that P(A ∪ B) > P(A) and P(A ∪ B) > P(B).

Hence, P(A) and P(B) are consistently defined.

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Check whether the following probabilities P(A) and P(B) are consistently defined(i) P(A) = 0.5, P(B) = 0.7, P(A ∩ B) = 0.6(ii) P(A) = 0.5, P(B) = 0.4, P(A ∪ B) = 0.8

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