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Need Solution for R.D. Sharma Maths Class 12 Chapter 30 Probability  Exercise Multiple Choice Questions Question 39 Maths Textbook Solution.

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Answer:(a)

Hint: You must know the rules of finding probability.

Given:A and B are two events such that \mathrm{A} \neq \emptyset, B=\emptyset

Solution:By the definition of conditional probability.

If A and B are two events such that 

P\left(\frac{A}{B}\right)=\frac{P(A \cap B)}{P(B)}

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