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

12.06.2025 20:13

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

and for binary 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)

Has a psychic ever made a crazy prediction that turned out to be true?

1234X

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

It’s a matter of interpretation.

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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

11010X

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