RAY: And...the answer is if you go back two terms, the previous term -- the last letters of the alphabet are z, y, and x in reversed order. So it would be x+y and the term before that would be x-x.
TOM: Oh, Sonia ??
RAY: Tara Lapinsky's tutu...x-x is zero rendering the whole expression...
TOM: See this is the kind of question that could be on the SAT exam.
TOM: And knowing nothing you would know that the answer is zero.
RAY: Because you couldn't possibly figure out...
TOM: Because you couldn't possibly figure out anything else. So if zero were one of the options, you just check it off without even thinking.
RAY: Well, when I first saw this, I had -- my first guess was one; the second was infinity, and the third was zero.
TOM: Was zero. Yeah, so you got it wrong twice. That's good.
RAY: Anyway who might our winner be, Tommy?
TOM: Ah, our winner might be Perry Lewis from Shrewsbury, Massachusetts, and it might not be.
RAY: But it might be.
TOM: But it might be Perry Lewis from Shrewsbury, Massachusetts.
[ Car Talk Puzzler ]