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  • Please Solve R.D. Sharma class 12 Chapter 30 Probability Exercise Multiple Choice Questions Question 9 Maths Textbook Solution.

Please Solve R.D. Sharma class 12 Chapter 30 Probability  Exercise Multiple Choice Questions Question 9 Maths Textbook Solution.

Answers (1)

Answer: (a)

Hint: You must know the rules of finding probability.

Given: A speaks truth = 75%

B speaks truth = 80%

Solution: P (A speaks truth) = 0.75

P (A lies) = 1 – 0.75 = 0.25

P (B speaks truth) = 0.8

P (B lies) = 1 – 0.8 = 0.2

P (contradicting each other) = P (A speaks truth B lies) + P (B speaks truth A lies)

\begin{aligned} &\Rightarrow(0.75 \times 0.2)+(0.8 \times 0.25) \\ &\Rightarrow 0.15+0.2 \\ &\Rightarrow 0.35 \\ &=\frac{35}{100}=\frac{7}{20} \end{aligned}

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