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

Last Updated: 18.06.2025 13:55

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

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

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)

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

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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

and for binary would be

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

How many couples swap wives?

It’s a matter of interpretation.

11010X

1234X

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