If one rolls a fair sides die twice, what is the probability

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If one rolls a fair sides die twice, what is the probability that the die will land on the same number on both the occasions ?

1. 1/12
2. 1/6
3. 1/24
4. 1/8

Correct Option: B

Let E = Event of getting same number on both the occasions
= (1, 1), (2, 2), (3, 3), (4, 4), (5, 5), (6, 6)
∴ n(E) = 6
∴ Required probability = 6/6² = 1/6