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grammarlyblog:

Well, not every time

Sometimes you should use an apostrophe to make a plural. Here’s a note from the Chicago Manual of Style and
Daily Writing Tips:

DO use the apostrophe to form the plural of an abbreviation that combines upper and lowercase letters or has interior periods:

The department graduated five M.A.’s and two Ph.D.’s this year.

NOTE: If you leave out the periods, you can write MAs but you’d still have to write PhD’s.

DO use the apostrophe to form the plural of lowercase letters:
Mind your p’s and q’s.

DO NOT use the apostrophe to form the plural of capital letters

Apostrophes being used incorrectly is a growing phenomenon that drives us up the wall.  This is a good guide. :)

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