Quote:
Originally Posted by AOII Angel
It is...but most accepted style manuals discourage its use. Each comma is like an "and" so putting a comma in front of "and" is a little redundant. It's my pet peeve because transcriptionist frequently add a comma where I purposely leave one out when I dictate reports. I used to spend hours removing commas from my final reports because I'm crazy!
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But it can be confusing if you leave it out. I refuse to drop the serial comma!
(And most of the grammar sites I just googled recommend its use.)