What is the sum of X+XX+XXX+XXXX?
14.06.2025 23:34
1234X
11010X
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
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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)
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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What is the sum of X+XX+XXX+XXXX?
It’s a matter of interpretation.
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour