I only have 113 pages, 243 posts, but in WMT, it reports 3513 web pages submitted

Selected answers from the Dumb SEO Questions Facebook & G+ community.

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  Alistair Lattimore: Submitting both sets won't harm your site to the best of my knowledge but it won't help either.
  
  One benefit of submitting them separately is that you can see how Google is going with indexing each type of URL, whereas if you submit an index sitemap file - you see total indexed URLs but not broken down by type.
  
  Since you're not having indexing problems, for simplicity I'd just submit the Yoast index sitemap, which may already be referenced in your robots.txt file anyway.
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  Jim Munro: Hi Charles. :)
  
  You are welcome here but posts which contain links to your site are not. Normally this post would be removed but since Alistair has already responded, please edit your post to disable the links by using a space instead of a dot. +Charles Lee ;
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  Charles Lee: oh yes +Jim Munro ! You mentioned this before! forgot about the linking part!! I've swapped it out. Sorry about that!
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  Charles Lee: Thanks +Alistair Lattimore for the notes!
  I was afraid that it would harm because it could mean the pages/posts being listed twice (or more times) and Google might see them as duplicate posts..
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  Alistair Lattimore: That isn't going to happen Charles, as Google uses the XML sitemap documents as a suggestion/hint as to what URLs exist on your site that you want crawled.
  
  If you listed the same URL twice or a dozen times and Google does for some reason crawl the URLs more regularly because it is listed more than once (unlikely) -- you are still only listing the same URL over and over again and not a 'variation' of each of those URLs.
  
  In addition to that, even if each of the submitted duplicate URLs were in fact different in some way (for example they included a query string argument on each one that was different -- they don't but just as an example); your WordPress blog will more than likely have rel=canonical tags implemented throughout which will instruct Google to merge the duplicate URLs caused by the example query string variations into the base URL that WordPress knows about.