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n must be the square of a rational number.

That is, n must be either a square number or the ratio of two square numbers.

For example, n = 16 then sqrt(n) = 4

Or n = 81/169 then sqrt(n) = 9/13

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12y ago
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Q: What is the value of 'n' for which under root 'n' be a rational number is?
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