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Prove that no number in the sequence 11, 111, 1111, 11111, .. is the square of an integer. 2. The three sides of a triangle

Prove that no number in the sequence 11, 111, 1111, 11111, ..

is the square of an integer.

2. The three sides of a triangle are of lengths l, m, and n, respectively.

The numbers l, m, and n are positive integers,

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