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

Last Updated: 30.06.2025 03:46

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

11010X

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

1234X

Why is the trade war between the United States and the rest of the world keeping on escalating, with US goods facing brutal boycotts from the global economy? Isn’t this horrific for US companies whose earnings and stocks are already collapsing?

and for binary would be

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)

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

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

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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