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  3. please explain the conception and follow the comment how many...

Question: please explain the conception and follow the comment how many...

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Please explain the conception and follow the comment

How many possible solutions exists for the equation x1 + x2 + x3 = 7 when x1; x2; x3 are
non-negative integers (i.e. x1; x2; x3 2 f0; 1; 2; 3; :::g).

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