What is the sum of X+XX+XXX+XXXX?
12.06.2025 08:50
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)
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
11010X
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1234X
It’s a matter of interpretation.
What is the sum of X+XX+XXX+XXXX?
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However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
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