> > 3) What is six times seven?
>
>
> The quote, from Restaurant at the End of the Universe, is (or at least was orignally if
> it's been changed in later printings) was "what do you get when you multiply 7 by 9," and
> the answer was "42."

Wrong.

It is, and has always been, "What do you get if you multiply six by nine".

> This of course is a math error, and no one really knows if it was another obscure joke or if
> it was just a misprint.

Also wrong.

Another thing it is, and always has been, is spelled out in full. It has never been "What do you get if you multiply 6 by 9".
And since it's difficult to mistype "seven" as "nine", and in any case given the context[1], it's fairly clear that it's a deliberate joke.

Paul


[1] Our heroes attempt to determine the Great Question of Life, the Universe, and Everything (to which the Answer is "Forty-two") and get:

"What do you get if you multiply six by nine?"
"Forty-two."
"I always said there was something fundamentally wrong with the universe."

This joke clearly wouldn't work if the Question was "What do you get if you multiply six by seven?"