What is the sum of X+XX+XXX+XXXX?
Last Updated: 19.06.2025 00:57
11010X
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
What is the sum of X+XX+XXX+XXXX?
1234X
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
Apple’s Music app in iOS 26 gains my favorite feature from the Mac - 9to5Mac
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
It’s a matter of interpretation.