What is the probability that when throwing two dice, an even sum of points will be obtained

What is the probability that when throwing two dice, an even sum of points will be obtained if it is known that at least one of them has rolled 3.

To find the probability of an event, you need to divide the number of favorable outcomes (in our case, these are those in which the sum of the points will be even) by the number of all possible outcomes.
Since we know that the number 3 fell on 1 die and the sum must be even, it means that in the second die we are satisfied with the case when an odd number falls out – that is, 1,3 and 5.
It turns out that there are 3 favorable outcomes. These are 3-3, 3-1, 3-5. Total outcomes 6. 3-1, 3-2, 3-3, 3-4, 3-5, 3-6.
Answer: 3/6 or 0.5