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

Last Updated: 02.07.2025 12:05

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

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

11010X

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)

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

and for binary would be

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

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1234X

It’s a matter of interpretation.

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

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