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## Main Question or Discussion Point

Let x and y be n-tuples of non-negative integers.

Furthermore,

sum x_i = sum y_i

and,

sum x_i^2 = sum y_i^2

Is it true that x must be a permutation of y?

Cheers!

Furthermore,

sum x_i = sum y_i

and,

sum x_i^2 = sum y_i^2

Is it true that x must be a permutation of y?

Cheers!