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well 0.9999… is actually 1 because
x = 0.9999... 10x = 9.9999... 10x (9.9999...) - x (0.9999...) = 9 9x = 9 x = 1 so 0.9999... is 1
This is muuuch better demonstrated by
1/3 = .33… 2/3 = .66… 3/3 = 0.99…
“Repeating” matters in approximations