What is the sum of X+XX+XXX+XXXX?
Last Updated: 23.06.2025 06:51

It’s a matter of interpretation.
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
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
The administration’s anti-consensus Mars plan will fail - SpaceNews
What is the sum of X+XX+XXX+XXXX?
11010X
1234X
Sex advice: I'm finally ready to enter my promiscuity era. But there's a catch. - Slate Magazine
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
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
Death threats to Astros pitcher Lance McCullers Jr. came from "overseas" resident - NBC Sports