What is the sum of X+XX+XXX+XXXX?
Last Updated: 21.06.2025 14:30
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
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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and for binary would be
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
It’s a matter of interpretation.
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1234X
11010X
What is the sum of X+XX+XXX+XXXX?