> how is calculating it in your own head brute-force
Doing this calculation in your head is not brute force, which was their entire point. Their math question was an example of why the brain isn't brute-forcing solutions, replying to this:
> What makes you think your brain isn't also brute forcing potential solutions subconciously and only surfacing the useful results?
Yes, many people can successfully calculate it through learned tricks or no learned tricks.
That is all I am saying. And my question is: how is calculating it in your own head brute-force, especially if done without such tricks?
No need to complicate it, answers to my question would suffice.