What's the most diplomatic way of calling a company and asking them to clarify a mistake on the job posting?

Basically I found a great job posting for what could be a dream job.

But then I noticed at the beginning of the posting, it says the job is in city A (where I live). Towards the end of the posting, it states the job is in city B.

Now this is a fairly large company so I'm sure it's all above board, just a typo from whoever uploaded it one way or the other. I want to call tomorrow to ask to clarify where the job is since I'd like to apply ASAP, I just want to go about it in the most diplomatic/polite way, since it's possible if I call and speak to HR it's very possible I'm calling to point out the mistake to the person who uploaded.

At the same time, I don't want to just call and ask which city the job is in, because then it may seem like I didn't look at the post.

Any advice would be appreciated!

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