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

10.06.2025 11:16

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

and for binary would be

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

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

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)

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11010X

1234X

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

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