Give the probability that the roll of a die will show 3 or 4.

There are 6 possible outcomes when rolling a fair six-sided die: 1, 2, 3, 4, 5, and 6. Out of these 6 outcomes, two of them (3 and 4) satisfy the condition of showing a 3 or 4. Therefore, the probability of rolling a 3 or 4 is 2/6 or 1/3.