What is the sum of X+XX+XXX+XXXX?

Last Updated: 28.06.2025 01:01

What is the sum of X+XX+XXX+XXXX?

*Note that the abbreviation XL (for XXXX) appeared quite late in the Roman period, and never found universal favour

1234X

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)

I caught my neighbor leaving his 12-year-old son home alone and he has not come back in 6 hours. Should I call CPS?

and for binary would be

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,

Did you know that by the end of the Biden/Harris regime, the United States' population will have increased by 7.46% in just 4 years? And historically, this type of mass immigration leads to a housing crisis and unaffordable housing for all?

11010X

What is the sum of X+XX+XXX+XXXX?

It’s a matter of interpretation.

China fast tracks rare earth export licences for European companies - Financial Times