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Mathematics 8 Online
OpenStudy (anonymous):

Which of the following sets of measures for sides doesn't form a triangle? 14, 18, 18 3, 3, 5 8, 8, 8 7, 9, 17

OpenStudy (jasonnewstedrocks):

The last one because by triangle inequality a+b>=c always. where a,b,c are sides of the triangle (credit to @d3v13 for explanation)

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