JEE Main | 2014Trigonometric EquationHard

Question

Let A and B be two events such that = , P(A ∩ B) = and P() = , where stands for the complement of the event A. Then the events A and B are

Options

A.Independent but not equally likely
B.Independent and equally likely
C.Mutually exclusive and independent
D.Equally likely but not independent

Solution

=   ⇒   P(A ∪ B) = 1-
P() = ⇒ P(A) = 1 -
∵   P(A ∪ B) = P(A)+ P(B) - P(A ∩ B)
+ P(B) -
P(B) =
∵   P(A) ≠ P(B) so they are not equally likely.
Also P(A) × P(B)
= P(A ∩ B)
∵   P(A ∩ B) = P(A).P(B) so A & B are independent.

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