1.

A student answers a multiple choice question with 5 altenatives, of which exactly one is correct. The probability that he knows the correct answer is p, 0 < p < 1. If he does not know the correct answer, he randomly ticks one answer. Given that he has answered tha question correctly, the probabilty that he did not tick the answer randomly, is-

Answer»

`(3p)/(4P + 3)`
`(5P)/(3p + 2)`
`(5p)/(4p + 1)`
`(4p)/(3p + 1)`

Answer :A::D


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