A freshman CPS major was practicing octal arithmetic on a problem he made up himself. He eventually exclaimed, "OK, I've got it!" and wrote:
572 + 167 + 434 = 1315 (all numbers octal)
After just a few seconds glance the grad student tutoring him said "Nope, sorry that's still wrong".
Was the grad student right? How could he reach this conclusion without having time to do the arithmetic?
Submitted by my dad w/ a solution (also by him) posted here
3 comments:
after reading this one, I had a guess at what kind of method was used, but didn't know the answer.
I am actually very surprised we never learned the trick in a certain class me and Nate took together at UD.
i was having some trouble with the formatting of the solution page. I think I have it fixed now, but if anything doesn't quite add up, assume that trailing 8's are just signifying that the number is in octal (lost subscripts) and anything else is right, just lost in translation :-p
That is cool
Post a Comment