1. If H$$_1$$ , H$$_2$$ , H$$_3$$ , ..., H$$_n$$ , are 'n' Harmonic means between ‘a’ and ‘b’ (≠ a), then value of $$\dfrac{H_{1}+a}{H_{1}-a}+\dfrac{H_{n}+b}{H_{n}-b}$$ is equal to
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