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  • Please Solve R.D. Sharma class 12 Chapter 30 Probability Exercise Multiple Choice Questions Question 8 Maths Textbook Solution.

Please Solve R.D. Sharma class 12 Chapter 30 Probability  Exercise Multiple Choice Questions Question 8 Maths Textbook Solution.

Answers (1)

Answer: (d)

Hint: You must know the rules of finding probability.

Given: 4 letters and addresses 4 envelopes

Solution: 4 letters can be placed in 4 envelopes in 4! Ways = 24 ways

Now there is only one method, by which all the letters are placed in right envelope.

P(all letters are placed in right envelopes) =\frac{1}{24}

 P(all letters are not placed in right envelopes) =

\begin{aligned} &\Rightarrow 1-P(\text { all letters are placed in right envelopes }) \\ &\Rightarrow 1-\frac{1}{24} \\ &\Rightarrow \frac{23}{24} \end{aligned}

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