What is the sum of X+XX+XXX+XXXX?
Last Updated: 01.07.2025 08:51

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)
1234X
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
Circle’s buzzy IPO was a big hit. Now comes the hard part. - MarketWatch
and for binary would be
It’s a matter of interpretation.
11010X
JPMorgan’s Jamie Dimon Sees Bond Market Crack — Why And What To Do - Forbes
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
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
What is the sum of X+XX+XXX+XXXX?
The #1 Underrated Food to Increase Your Magnesium Intake, According to Dietitians - EatingWell