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Mathematics - Probability Question with Solution | TestHub

MathematicsProbabilityGeneral (Event SS, Definitions, Odd against/Favour)Medium2 minQB

MathematicsMediummatching list

Exactly 3 of n>6 people know an answer. People are asked in random order and P_r is the probability that the rth person is the first who knows. Match List-I with List-II.

Options:

Answer:

Solution:

Direct counting gives $P \to 2, P_{2} = \frac{n - 3}{n} \frac{3}{n - 1} \to 1, P_{n - 2} = 1/ (3 n) \to 3$ , and the general formula maps $S \to 4$ .

Stream:JEESubject:MathematicsTopic:ProbabilitySubtopic:General (Event SS, Definitions, Odd against/Favour)

⏱ 2mℹ️ Source: QB

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