Not to worry though: Within literally a minute of my post I received a high-hard (though well-deserved) "education" from several of my fellow Freepers. Ah, well ... getting old sometimes isn't all it's cracked up to be (though it has its advantages and, as my father often said, it's better than the alternative). Cheers!
Every FReeper that has been here for a 'short period of time' has made math mistakes, BUT, we don't have producers, directors, and flunkies feeding us every word or thought that we post.
Some other idiots had to be involved in that fiasco, it was not brian williams that put the copy of the tweet on the screen.
Some producer knew this segment was coming up, and I doubt that williams is even smart enough to realize the error, even after it was pointed out to him at a later time.