What is the sum of X+XX+XXX+XXXX?

Last Updated: 28.06.2025 09:23

What is the sum of X+XX+XXX+XXXX?

and for binary would be

Given the use of upper case, I personally would initially assume Roman numerals*, so the answer would be C (100 in present-day decimal notation)

as would be assuming that these are representations of conventional numbers, in which case the answer for number bases of five or more would be

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11010X

However, X +X^2 +X^3 + X^4 is a valid algebraic answer,

What is the sum of X+XX+XXX+XXXX?

If the United States leaves the EU to fend for themselves in the economy and NATO, could Europe become irrelevant in the global economy compare to China and America dominance in the world stage in AI and semiconductors? Will Europe become cash poor?

It’s a matter of interpretation.

*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour

1234X

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