What is the sum of X+XX+XXX+XXXX?
Last Updated: 02.07.2025 14:59
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
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
We interrupt the Musk-Trump feud with a teensy bit of news from the climate front - Daily Kos
1234X
What is the sum of X+XX+XXX+XXXX?
and for binary would be
High-Average, Low-Slugging Hitters Are Back, and Baseball Is Better for It - Sports Illustrated
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
11010X
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)