You are rolling a 6-sided number cube with the numbers 1 through 6. Which of the following represents the probability of rolling an even number?

The even numbers on a 6-sided cube are 2, 4, and 6, so there are 3 favorable outcomes out of 6 equally likely outcomes. The probability is 3/6 = 1/2. Therefore, the correct choice is 1/2.

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