Question

If 'A' and 'B' are two events, such that P(A)0 and P(B/A) = 1 then.

Options

• A ⊂ B

• B ⊂ A

• B = `phi`

• A = `phi`

Answer 1

A ⊂ B

Explanation:

P(B/A) = 1

⇒ `(P(A ∩ B))/(P(A))` = 1

∴ P(A B) = P(A)

Where A B, A B = A

∴ P(A B) = P(A)