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

Last Updated: 26.06.2025 04:56

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

1234X

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

However, X +X^2 +X^3 + X^4 is a valid algebraic answer,

I am upper middle class and study at the London School of economics and Finance (economics and Finance). I am 18 years old. What are my chances of becoming a billionaire?

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

It’s a matter of interpretation.

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

11010X

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)

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