I'm not sure if it was the MH problem--all I can remember for sure was that it was a probability problem that was simple to state and the immediately obvious answer was wrong--but I have a similar story. Except I blew the problem and didn't get the job.

It was 1982. A small company from the Pacific Northwest called Microsoft sent some engineers down to recruit at Caltech. I was a senior that year, and interviewed with them. They asked me their probability problem, I got it wrong, and did not receive an offer.

I've occasionally wondered how different things would have been had I got it right, and so maybe got an offer, and accepted [1]. I think pretty much every engineer that started at Microsoft around that time and stuck with it (which I almost certainly would have done) ended up quite well off.

I've also wondered if any of the engineers that interviewed me are people whose names I would now recognize.

[1] It was not at all certain I would have accepted. I was more interested in bigger machines than the microprocessors MS was focused on, and also had a strong preference for staying in the Los Angeles area.