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

Last Updated: 23.06.2025 21:43

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

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

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

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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and for binary would be

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

It’s a matter of interpretation.

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

11010X

1234X

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