Probability of 3 students solving a question are  and . Probability to solve the question is:

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BSSC Inter Level Pre PYP (5th Feb 2017)
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BSSC Inter Level: GK (Mock Test)
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Probability of 3 students,

P(A) = 1/2, P(A̅) = 1/2

P(B) = 1/3, P(B̅) = 2/3

P(C) = 1/4, P(C̅) = 3/4

So, Probability of no one solve the question is =  = 1/4

⇒ P(None) = 1/4

Then, The probability to solve the question is = 1 - 1/4 = 3/4

Hence, the correct answer is "3/4".

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