boct1584: Actually, what exactly the Ultimate Question was, was never revealed. Near the end of
Life, the Universe, and Everything, Prak told us that knowing the Question and knowing the Answer are mutually exclusive.
It was revealed in
Mostly Harmless if I'm not mistaken. And it was revealed as What is 7 multiplied by 6? My recollection is hazy but I seem to recall some burning bushes spelling it out.
Also here's a fun fact: Several years back at a renaissance festival in Escondido, California, my friend pointed out to me an absolutely perfect "42" shape in the clouds.