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Misc 18 - If P(A|B) > P(A), which is correct - NCERT - Miscellaneous

Misc 18 - Chapter 13 Class 12 Probability - Part 2

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Misc 18 If P(A|B) > P(A), then which of the following is correct : (A) P(B|A) < P(B) (B) P(A ∩ B) < P(A) . P(B) (C) P(B|A) > P(B) (D) P(B|A) = P(B) Given P(A|B) > P(A) (𝑃(𝐴 ∩ 𝐡))/(𝑃(𝐡))>"P(A") P(A ∩ B) > P(A) . P(B) Finding P(B|A) P(B|A) = (𝑃(𝐴 ∩ 𝐡))/(𝑃(𝐴)) From (1) P(A ∩ B) > P(A) . P(B) Dividing by P(A) both sides (𝑃(𝐴 ∩ 𝐡))/(𝑃(𝐴))>(𝑃(𝐴). 𝑃(𝐡))/(𝑃(𝐴)) P(B|A) > P(B) So, C is the correct answer.

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.