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In a triangle, the sum of lengths of two sides is x and the product of the lengths of the same two sides is y. If x 2 – c 2 = y, where c is the length of the third side of the triangle, then the circumradius of the triangle is :

1. 3 y
2. 3 c
3. 3 c
4. 2 3 y

Correct answer: 3 c

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