What is the sum of X+XX+XXX+XXXX?
Last Updated: 20.06.2025 00:15

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
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
Forget Florida — these two unexpected states are the new retirement hot spots - Yahoo Finance
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
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
Do women like men who have slept with many women?
It’s a matter of interpretation.
11010X
1234X
How do flat Earthers explain the existence of other spherical planets?