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

Last Updated: 20.06.2025 07:09

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

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

and for binary would be

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It’s a matter of interpretation.

1234X

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

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

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

11010X

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