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Why the third one which is 19 is not an answer together with II?
If this side is 19=> the size will be 3,7,9, and the sum of any two is not smaller than any of the sides.

3,7,9 doesn't form an isoceles triangle

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Which of the following could be the perimeter of an isosceles triangle if one side has length 3 inches and another side has length 7 inches?
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