What is the sum of X+XX+XXX+XXXX?
12.06.2025 04:20
1234X
11010X
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
Geomagnetic storm could make northern lights visible in Chicago on Sunday night - Chicago Sun-Times
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)
Manufacturing PMI® at 48.5%; May 2025 Manufacturing ISM® Report On Business® - PR Newswire
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
What is the sum of X+XX+XXX+XXXX?
It’s a matter of interpretation.