Discussion

Explanation:

When a dice is rolled total possible outcomes (i.e., 1 or 2 or 3 or 4 or 5 or 6) = 6.
    
Desired outcomes (i.e., 2 or 4 or 6) = 3.

∴ Required probability = 3/6 = 1/2.

Hence, option (a).

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