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Provide Solution For  R.D. Sharma Maths Class 12 Chapter 30 Probaility  Exercise Multiple Choice Questions Question 27 Maths Textbook Solution.

Answers (1)

Answer: (c)

Hint: You must know the rules of finding probability.

Given:P(A)=\frac{4}{5}, P(A \cap B)=\frac{7}{10}, P\left(\frac{B}{A}\right)=?

Solution:

\begin{aligned} &P(A)=\frac{4}{5}, P(A \cap B)=\frac{7}{10} \\ &P\left(\frac{B}{A}\right)=\frac{P(A \cap B)}{P(A)} \\ &=\left(\frac{7}{10}\right) \times\left(\frac{5}{4}\right) \\ &=\frac{35}{40}=\frac{7}{8} \end{aligned}

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