Might have been 6 x 9.

>Wasn't it 6 x 9.
>
>42 in base 13.
>
>Then again...
>
>http://groups.google.com/group/alt.fan.douglas-adams/msg/d1064f7b27808692
>
>
>
>>As I remember it it does not equal 42 like 6X7 does. I thought it was 7X9 but it may 7X8 or some other multiplication, but it definitely does not equal 42, which was the joke of it.
>>
>>
>>>Or maybe 'What is 6 x 7?' :o)
>>>
>>>
>>>>>And the answer to 42 was ?
>>>>>
>>>>>>42
>>>>
>>>>What is 7 X 9?