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A single, six-sided die is rolled. Find the probability of rolling an odd number or a number less than 5.

The probability is $◻$. (Type an integer or a fraction. Simplify your answer)

Step 1 ：The question is asking for the probability of rolling an odd number or a number less than 5 on a six-sided die.

Step 2 ：First, let's consider the total number of outcomes when a six-sided die is rolled, which is 6 (1, 2, 3, 4, 5, 6).

Step 3 ：Next, let's consider the outcomes that satisfy the condition of being an odd number or a number less than 5. The odd numbers on a six-sided die are 1, 3, and 5. The numbers less than 5 are 1, 2, 3, and 4.

Step 4 ：However, we should note that the numbers 1, 3 are repeated in both conditions. So, we should only count them once.

Step 5 ：Therefore, the favorable outcomes are 1, 2, 3, 4, and 5.

Step 6 ：The probability of an event is calculated as the number of favorable outcomes divided by the total number of outcomes.

Step 7 ：Let's calculate this probability. The favorable outcomes are 5 and the total outcomes are 6. So, the probability is $\frac{5}{6}$.

Step 8 ：Final Answer: The probability of rolling an odd number or a number less than 5 on a six-sided die is $\boxed{{\displaystyle \frac{5}{6}}}$.