Find the odds of getting a 1 or a 4 and then subtract your result from 1 (probability of the complement of getting a 1 or a 4).
A fair die has six possible outcomes when tossed: {1, 2, 3, 4, 5, 6}. The probability of getting a 1 or a 4 on one toss is 1/6 + 1/6, or 2/6, or 1/3.
Thus, the odds of NOT getting a 1 or a 4 is 1 - 1/3, or 2/3.