What is the sum of X+XX+XXX+XXXX?
Last Updated: 26.06.2025 01:14

It’s a matter of interpretation.
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)
GOP megabill could undermine US energy production, Republicans warn - Politico
What is the sum of X+XX+XXX+XXXX?
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
Key moments from the third week of Sean ‘Diddy’ Combs’ sex trafficking trial - AP News
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
and for binary would be
1234X