x 3 + y 3 + z 3 x^3 + y^3 + z^3

Alex and Brian are discussing:

Alex: 405 can be written as a sum of three positive cubes.

Brian: But I think 645 can be written as a sum of three positive cubes.

Who is correct?

Alex Both of them Brian Neither of them

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1 solution

Denton Young
Jul 26, 2018

405 = 216 + 125 + 64

645 = 512 + 125 + 8

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