Correct Answer - Option 2 : 1/3
Concept:
If S is a sample space and E is a favourable event then the probability of E is given by:
\(\rm P(E)=\frac{n(E)}{n(S)}\)
Calculation:
The set, S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12} is a sample space for the given experiment.
So, n(S) = 12
The set, E = {3, 6, 9, 12} contains the numbers that are divisible by 3.
So, n(E) = 4
\(\rm P \left( {{\rm\text{divisible by 3}}} \right) = \frac{{n\left( E \right)}}{{n\left( S \right)}} = \frac{4}{{12}} = \frac{1}{3}\)