Probability of 3 students solving a question are 1/2, 1/3, and 1/4. Probability to solve the question is:

Question: Probability of 3 students solving a question are 1/2, 1/3, and 1/4. Probability to solve the question is:

Solution:
Probability of 3 students,
P(A) = 1/2, ∴ P(A′) = 1/2
P(B) = 1/3, ∴ P(B′) = 2/3
P(C) = 1/4, ∴ P(C′) = 3/4

So, Probability of no one solve the question is = (1/2) × (2/3) × (3/4)
= 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.