All you math geniuses

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Below is a probability problem, that I can't come up with the same answer as ETS on the sample college math exam. Can anyone help?

[I]The faces of a fair cube are numbered 1 through 6; the probability of rolling any number from 1 through 6 is equally likely. If the cube is rolled twice, what is the probability that an even number will appear on the top face in the first roll or that the number 1 will appear on the top face in the second roll[/I]

So as explained in the "Cracking the Clep" book, I figured the first roll would be 3/6 and the second roll would be 1/6. Add those together and you get 4/6, reduced to 2/3. That is one of the answers but they say the correct answer is 7/12. Where am I going wrong?

Urg, I am never gonna get through this exam.