Wow! The last time I looked was more than 2 years ago, so this video was uploaded since then. Thanks for posting. I don't recall the vocal being a choral group, but rather a very masculine solo voice, but it's definitely the same jingle.
I remember it the same way you do. Maybe they had multiple versions of it?
That was a terrible commercial. But I did enjoy the teacher pulling her glasses down to check out that HOT math at the end.