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HappySqurriel said:

You're essentially asking whether the limit of the sequence 0.9 * (0.1^n) is equal to 1 with n starting at 0 and going to infinity ... the answer is yes, but in order to prove it you must first take calculus

The sequence  0.5 * (0.5^n) is also equal to 1 with n starting at 0 and going to infinity

And when you get into number theory you'll find out why that is an oversimplification that we use to express numbers.

 



I would cite regulation, but I know you will simply ignore it.