What is the sum of X+XX+XXX+XXXX?
Last Updated: 20.06.2025 10:49

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)
What is the sum of X+XX+XXX+XXXX?
11010X
Why can’t my wife just accept the fact that I’m going to cheat?
It’s a matter of interpretation.
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
SpaceX launch from California sends 26 Starlink satellites into low Earth orbit - Space
and for binary would be
1234X
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
Brad Pitt Wears a Cobalt Blue Velvet Blazer and Barrel Jeans with Ines de Ramon - instyle.com