What is the sum of X+XX+XXX+XXXX?
10.06.2025 02:06

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
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
How do military families handle communication when a service member is injured overseas?
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
It’s a matter of interpretation.
11010X
2 shot outside Minnesota high school graduation, suspect in custody: Police - ABC News
What is the sum of X+XX+XXX+XXXX?
1234X
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,