What is the sum of X+XX+XXX+XXXX?
10.06.2025 00:23
What is the sum of X+XX+XXX+XXXX?
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)
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
1234X
and for binary would be
11010X
2025 U.S. Nationals: Day 2 Prelims Live Recap - SwimSwam
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
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
NASA Is Planning to Build a Massive Telescope on the Moon’s Dark Side - The Daily Galaxy