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12-67.

Multiple Choice: Which number below could be the length of the third side of a triangle with sides of length 29 and 51? Homework Help ✎

1. $10$

1. $18$

1. $23$

1. $81$

See problem 5-103. What do you notice about the relationship between the maximum and minimum side lengths for the third side and the lengths of the first two sides?