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  • Need Solution for R.D.Sharma Maths Class 12 Chapter 30 Probability Exercise 30.5 Question 30 Sub Question 3 Maths Textbook Solution.

Need Solution for R.D.Sharma Maths Class 12 Chapter 30 Probability  Exercise 30.5 Question 30 Sub Question 3 Maths Textbook Solution.

Answers (1)

Answer:\frac{24}{35}

Hint: You must know the rules of finding probability functions.

Given:

P\left ( Fatima\: gets\: selected \right )=\frac{1}{7}=P\left ( A \right )

P\left ( John\: gets\: selected \right )=\frac{1}{5}=P\left ( B \right )

Solution:

P\left ( none\:one\: of\: them\: gets\: selected \right )=P\left ( \bar{A} \right )\times P\left ( \bar{B} \right )

\begin{aligned} &=\left(1-\frac{1}{5}\right) \times\left(1-\frac{1}{7}\right) \\ &=\frac{4}{5} \times \frac{6}{7} \\ &=\frac{24}{35} \end{aligned}

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