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  • Please solve RD Sharma class 12 chapter Probability exercise 30.2 question 11 maths textbook solution

Please solve RD Sharma class 12 chapter Probability exercise 30.2 question 11 maths textbook solution

Answers (1)

Answer:

 \frac{3}{7}

Hint:

\begin{aligned} &\text { Probability }=\frac{\text { No. of event favourable outcomes }}{ \text { Total no. of outcomes }} \end{aligned}

Given, events

            A=A black ball in the 1st draw

            B=A black ball in the 2nd draw

Now,

\begin{aligned} &P(A)=\frac{10}{15}=\frac{2}{3}\\ &P\left ( \frac{B}{A} \right )=\frac{9}{14}\\ &\text { Required Probability }=P(A\cap B)\\ &=P(A)\times P\left ( \frac{B}{A} \right )\\ &=\frac{2}{3}\times \frac{9}{14}\\ &=\frac{3}{7} \end{aligned}

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Gurleen Kaur

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