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  • Please Solve R.D. Sharma class 12 Chapter 30 Probability Exercise Multiple Choice Questions Question 14 Maths Textbook Solution.

Please Solve R.D. Sharma class 12 Chapter 30 Probability  Exercise Multiple Choice Questions Question 14 Maths Textbook Solution.

Answers (1)

Answer: (a)

Hint: You must know the rules of finding probability.

Given: Urn contains 9 balls = [2 red + 3 blue + 4 black]

Three balls are drawn

Solution: Red balls = 2

Blue balls = 3

Black balls = 4

P(all three balls are same colour) = P(all three are blue) + P(all 3 are black)

\begin{aligned} &=\frac{3}{9} \times \frac{2}{8} \times \frac{1}{7}+\frac{4}{9} \times \frac{3}{8} \times \frac{2}{7} \\ &=\frac{1}{84}+\frac{4}{84} \\ &=\frac{5}{84} \end{aligned}

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