Hacker News new | past | comments | ask | show | jobs | submit login

The likelihood of 1/2^80 is on the same order as me picking out a thousand grains of sand from the Sahara desert, spreading them randomly out through the desert and having you pick out those exact thousand grains of sand.

It's a practical impossibility, a philosophical exercise.

No, it's not the same order. 1/2^80 is the same order as the likelihood of as picking 1000 grains out of 1010, and I'm sure you'll agree that Sahara has more grains that 1010.

However, if you picked a single grain from Sahara desert, you'll be only 2 or 3 orders of magnitude off, so one could say that 2^-80 is only slightly easier than finding a particular grain in a Sahara desert.

Yes, but 1/2^80 is ridiculously large compared to 1/2^1024.

Applications are open for YC Winter 2020

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact