CBSE Class 12 Sample Paper for 2020 Boards

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Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Question 4 - CBSE Class 12 Sample Paper for 2020 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at August 4, 2026 by

If A and B are two events such that P(A) = 0.2 , P(B) = 0.4 and P(A āˆŖ B) = 0.5 , then value of P(A|B) is ?

(a) 0.1Ā  Ā  Ā  Ā  Ā  Ā  Ā (b) 0.25Ā  Ā  Ā  Ā  Ā  Ā  Ā (c) 0.5Ā  Ā  Ā  Ā  Ā  Ā  Ā (d) 0.08

If P(A) = 0.2 , P(B) = 0.4 and P(A U B) = 0.5, then value of P(A|B) is

Question 4 - CBSE Class 12 Sample Paper for 2020 Boards - Part 2

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Question 4 If A and B are two events such that P(A) = 0.2 , P(B) = 0.4 and P(A āˆŖ B) = 0.5 , then value of P(A|B) is ? (a) 0.1 (b) 0.25 (c) 0.5 (d) 0.08 We know that P(A|B) = (š‘ƒ(š“" āˆ© " šµ))/(š‘ƒ(šµ)) Finding P (A āˆ© B) Now, P(A āˆŖ B) = P(A) + P(B) ā€“ P(A āˆ© B) 0.5 = 0.2 + 0.4 ā€“ P(A āˆ© B) 0.5 = 0.6 ā€“ P(A āˆ© B) P(A āˆ© B) = 0.6 ā€“ 0.5 P(A āˆ© B) = 0.1 Now, P(A|B) = (š‘ƒ(š“" āˆ© " šµ))/(š‘ƒ(šµ)) = 0.1/0.4 = 1/4 = 0.25 So, correct answer is (c) 0.25 1 mark

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