If A and B are two events such that P(A)...

If A and B are two events such that `P(A)!=0`and `P(B | A) = 1`; then(A) `AsubB` (B) `BsubA` (C) `B=varphi` (D) `A=varphi`

A

`A sub B `

B

`B sub A `

C

`B = varphi`

D

`A = varphi`

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The correct Answer is:

A

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