I think you are on to something here, if you think the 69 like a yin-yang sign.
However, perl doesn't think so, try:
perl -e 'print 6 x 9'
Must be that missing 12....
Personally, I think that the answer was given in an dyslexic way, and should have been 24. But if it still is 42, then the factors are 2*3*7, which on an upside-down TI82 would spell all letters... however, in which order should they be?
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