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

Last Updated: 02.07.2025 07:46

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

11010X

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

1234X

Could humans be selectively bred, like dogs, to create 2 subspecies that can no longer have offspring? Do I not understand selective breeding properly? Im not worried about the moral implications, just the science please.

*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,

and for binary would be

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

It’s a matter of interpretation.

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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