When talking about more than one PDA should it be PDAs or PDA's?

Question

When talking about more than one PDA should it be PDAs or PDA's?

Answer 1

If you're doing college writing or if you're writing for a publication that has a preferred style manual, follow that manual.

Generally, though, PDAs is the plural of PDA. Of course, if you're saying "I was pleased with the PDA's efficiency", that's correct.

Answer 2

PDAs is plural  PDA's is possessive (meaning the PDA possesses something)

Answer 3

This is effectively asking if plural acronyms need the apostrophe or not. The same also applies to dates such as "the 1900s" or 1900's.

Modern usage does not require the apostrophe; however, many acronyms look strange with an "s" tacked on without an apostrophe and are more awkward to read. And when the text is all in caps, adding an "s" without an apostrophe can make the acronym confusing, even unreadable.

So it is OK to omit the apostrophe if the "s" will be lower case, and it's a familiar acronym, but I suggest using it at all times, including for dates, thus:

PDA's, 1900's, etc, rather than PDAs and 1900s.