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JEE Advance - Mathematics (1985 - No. 28)

The set of all real numbers $$a$$ such that $${a^2} + 2a,2a + 3$$ and $${a^2} + 3a + 8$$ are the sides of a triangle is ...........
(-5, -1)
(5, ∞)
(-∞, -5) ∪ (-1, ∞)
(-∞, -5)
(-1, ∞)

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