Creation of triangle

N N line segments, with lengths no greater than 10 inches, and no shorter than 1 inch, are given. What is the minimum value of N N such that you are assured to make a triangle with any 3 line segments without violating the triangle inequality?


The answer is 7.

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1 solution

Aditya Kumar
Apr 7, 2015

Consider any 3 arbitrary lines in the domain of 1 10 1-10 . If we consider the worst case such that these lines violate the triangle inequality, then we have to look upon for next set of 3 lines. Now, again if they violate the triangle inequality, we may arrange the six line segments in the groups of two. Now we may take any arbitrary line it will sure that it will not violate the triangle inequality in any one of the groups. So on adding we get, minimum number of line segments = 7 =7

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