2,000
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A0 is twice the size of A1 A1 is twice the size of A2 A2 is twice the size of A3 A3 is twice the size of A4 A4 is twice the size of A5 A5 is twice the size of A6 And so on
"MMVII" is the year 2007, represented as a Roman numeral. (M= 1000, twice, V=5, I=1, twice. 1000+1000+5+1+1 = 2007.)
None. The sum of one digit can't be twice the size of the digit.
1km
1000