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JEE Mains · Maths · STD 12 - 13. probability

माना \(A\) तथा \(B\) दो ऐसी स्वतंत्र घटनाएँ हैं कि \(P ( A )=\frac{1}{3}\) तथा \(P ( B )=\frac{1}{6}\) हैं, तो निम्न में से कौन सा सत्य है?

  1. A \(\mathrm{P}(\mathrm{A} / \mathrm{B})=\frac{2}{3}\)
  2. B \(\mathrm{P}(\mathrm{A} /(\mathrm{A} \cup \mathrm{B}))=\frac{1}{4}\)
  3. C \(\mathrm{P}\left(\mathrm{A} / \mathrm{B}^{\prime}\right)=\frac{1}{3}\)
  4. D \(\mathrm{P}\left(\mathrm{A}^{\prime} / \mathrm{B}^{\prime}\right)=\frac{1}{3}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\mathrm{P}\left(\mathrm{A} / \mathrm{B}^{\prime}\right)=\frac{1}{3}\)

Step-by-step Solution

Detailed explanation

\(\mathrm{P}(\mathrm{A} / \mathrm{B})=\mathrm{P}(\mathrm{A})=\frac{1}{3}\) \(P(A /(A \cup B))=\frac{P(A \cap(A \cup B))}{P(A \cup B)}=\frac{P(A)}{P(A \cup B)}\) \(=\frac{\frac{1}{3}}{\frac{1}{3}+\frac{1}{6}-\frac{1}{18}}=\frac{3}{4}\)…
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