What is the sum of X+XX+XXX+XXXX?
Last Updated: 02.07.2025 06:55
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)
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
NJ electric bills are about to jump 20% — who's to blame and what can you do? - Gothamist
What is the sum of X+XX+XXX+XXXX?
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
and for binary would be
If Iran’s Oil Is Cut Off, China Will Pay the Price - WSJ
1234X
It’s a matter of interpretation.
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
Mild US Inflation Is Backdrop for Fed’s Powell on the Hill - Bloomberg.com