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

Last Updated: 28.06.2025 21:33

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)

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

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

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1234X

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

It’s a matter of interpretation.

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and for binary would be

11010X

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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