This is good example of why I asked the question of you in another reply. You have not carefully read or understood the adjectiveconsecutive.

The question says that the two integers are consecutive, like 29 and 30.

That pair works because .

But because the pair does not work.

So how pairs of consecutive integers work?

In total So how pairs of consecutive integers are there in the given range?

Then divide to get the probability.