Comment by ang_cire
11 hours ago
Um, that's really easy to do in your head, there's no carrying or anything? 7,070
7 * 101 = 707 * 10 = 7,070
And computers don't brute-force multiplication either, so I'm not sure how this is relevant to the comment above?
I think it is very relevant, because no brute-forcing is involved in this solution.
That's not true, the 'brute force' part is searching for a shortcut that works.
The brute force got reduced down to fast heuristics, like Arthur Benjamin's Mathemagics.
It’s almost like you’re proving the point of his reply…