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  • Need solution for RD Sharma maths class 12 chapter Probability exercise 30.2 question 3

Need solution for RD Sharma maths class 12 chapter Probability exercise 30.2 question 3

Answers (1)

Answer:

 \frac{7}{22}

Hint:

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

Let, A = White ball in first draw.

        B = White ball in second draw.

Solution:

Now,

\begin{aligned} &P(A)=\frac{7}{12}\\ &P\left ( \frac{B}{A} \right )=\frac{6}{11}\\ &\text { Required Probability }=P(A\cap B)\\ &=P(A)\times P\left ( \frac{B}{A} \right )\\ &=\frac{7}{12}\times \frac{6}{11}\\ &=\frac{42}{132}\\ &=\frac{7}{22} \end{aligned}

Posted by

Gurleen Kaur

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