Q. 245.0( 5 Votes )

# If A and B are two independent events such that P(A’ ∩ B) = 2/15 and P(A ∩ B’) = 1/6 then find P(A) and P(B).

Answer :

Basic Idea: If A and B are two independent events then

P(A B) = P(A)P(B) and A’ and B or B’ and A are also independent and same logic can be applied to them.

Let P(A) = x and P(B) = y

P(A’) = 1 – x and P(B’) = 1 – y

Given that,

A and B are independent. So,

P(A’ B) = P(A’)P(B) = 2/15

(1-x)y = 2/15 …(1)

Similarly, P(A B’) = P(A)P(B’) = 1/6

x(1-y) = 1/6 …(2)

From equation 1 and 2 we can write as-

180x2 + 30 = 186x

180x2 – 186x + 30 = 0

also x =

P(A) =

Putting x = in equation 1,we get

y =

Hence,

P(A) = 1/5, 5/6

Or P(B) = 1/6, 4/5

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