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

Last Updated: 18.06.2025 08:22

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

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

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

11010X

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It’s a matter of interpretation.

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)

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

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1234X

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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