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Question

In a multiple choice question, there are four alternative answers, of which one or more are correct.A candidate decides to tick the answers at random. If he is allowed up to 3 chances to answer the question, the probability that he will get marks in the question is

A
115
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B
6213375
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C
15
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D
415
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Solution

The correct option is D 15
The total possible answers, he can give =C(4,1)+C(4,2)+C(4,3)+C(4,4)=15
and among them only one is correct and he can give three attempts.
The required probability (getting correct) =315=15

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