Is my Macbook Pro missing a graphics card?...

I purchased a 15-inch Macbook Pro from the Official Apple Store in March 2012. It's a late 2011 model.

A friend asked me about my graphics card. I wanted to check, but couldn't find that information on my computer.

I read this article:

http://support.apple.com/kb/HT4152

Apparently:

Two entries should appear under Video Card: "Intel HD Graphics 3000" and "AMD Radeon HD 6750M" or "AMD Radeon 6770M".

Both of those cards sound familiar from when I purchased the Macbook Pro. However, I only have Intel HD Graphics 3000 listed.

I am running OS X Lion.

Did something happen to my graphics card? Did it go missing? Did I never get one in the first place? Or am I looking in the wrong location?

I'm no longer able to make free support calls, so I'd appreciate any help that I can get.

Thank you.