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  • Please Solve R.D. Sharma class 12 Chapter 30 Probability Exercise Multiple Choice Questions Question 16 Maths Textbook Solution.

Please Solve R.D. Sharma class 12 Chapter 30 Probability  Exercise Multiple Choice Questions Question 16 Maths Textbook Solution.

Answers (1)

Answer: (a)

Hint: You must know the rules of finding probability.

Given: five persons entered the lift cabin on the ground floor of an 8 floor house.

Suppose that each of them independently and with equal probability.

Solution: Total possible ways of leaving the lift = 7 \times 7 \times 7 \times 7 \times 7=(7)^{5}

5 people can leave different floors in { }^{7} P_{5} ways

P(5 people leaving lift at different floors) = \frac{{ }^{7} P_{5}}{(7)^{5}}

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