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Isn't it more like: N-illion = (Size_of_Digit_Grouping)^(n-1) Since the OP was saying groupings use to be by 6-digits, not 3-digits (i.e. "1,000") as seen t

Isn't it more like: N-illion = (Size_of_Digit_Grouping)^(n-1) Since the OP was saying groupings use to be by 6-digits, not 3-digits (i.e. "1,000") as seen today.