P≤ft(A/B') is defined only when

Correct Answer is : BBB is not a sure event

Correct Answer is : BBB is not a sure event

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Probability

Question : 20 of 127

Marks: +1, -0

P\left(\frac{A}{B'}\right)

is defined only when

Solution:

Concept:

Conditional probability

P(A/B')

is defined only when

P(B') > 0

, i.e.,

B

is not a sure event.

Explanation:

P(A/B') = \frac{P(A \cap B')}{P(B')}

, which requires

P(B') \neq 0

P(B') = 0

if and only if

P(B) = 1

, meaning

B

is a sure event.

Thus

P(A/B')

is defined exactly when

B

is not a sure event.

Answer:

B

is not a sure event

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