What is the sum of X+XX+XXX+XXXX?
Last Updated: 03.07.2025 00:02

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)
11010X
However, X +X^2 +X^3 + X^4 is a valid algebraic answer,
What are reasons you couldn't be a kpop idol?
What is the sum of X+XX+XXX+XXXX?
It’s a matter of interpretation.
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
Renck: If J.K. Dobbins stays healthy, he’ll be reason Broncos win AFC West - The Denver Post
*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour
1234X
and for binary would be
Bitcoin (BTC) Price Climbs After Trump Tells GOP Not to Worry About Deficit Spending - CoinDesk