I tend to go by two things against itartanis_neravar said:It all depends on the circumstanced but I would say that more times then not your friend is absolutely correctFeste the Jester said:Not my belief, but it's a controversial one among my friend. My friend Dylan doesn't not consent to the idea that .999999... is equivalent to 1.
1. They're two separate numbers if you can place a number between them, which you can't in this situation
2. x = 0.9...
10x - x = 9x
9.9... - 0.9... = 9
therefore 0.9... = 1