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23 November, 17:49

make a conjecture, is there a value of N for which there could be a triangle with sides of length N, 2N, and 3N?

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  1. 23 November, 17:56
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    Answer: Conjecture: There is no triangle with side lengths N, 2N, and 3N (where N is a positive real number)

    Proof:

    We prove this by contradiction: Suppose there was an N for which we can construct a triangle with side lengths N, 2N, and 3N. We then apply the triangle inequalities tests. It must hold that:

    N + 2N > 3N

    3N > 3N

    3 > 3

    which is False, for any value of N. This means that the original choice of N is not possible. Since the inequality is False for any value of N, there cannot be any triangle with the given side lengths, thus proving our conjecture.
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