Which of the following sets of numbers can be used as the lengths of the sides of a triangle ?
In a triangle, the sum of two sides is always greater than the third side.
In the last two options, sum of first two sides is less than third side, and in first two options sum is equal to third side, hence these three are not possible.
Thus, possible lengths of triangle = [5,7,9]
=> Ans - (B)
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