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

12.06.2025 08:36

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

1234X

and for binary would be

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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It’s a matter of interpretation.

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

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

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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)

11010X

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

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