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Question 1
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If $H_1,H_2,\ldots,H_n$ are n harmonic means between a and b $(b\ne a)$;,then $\frac{{{H}}_n+a}{{{H}}_n-a}+\frac{{{H}}_n+b}{{{H}}_n-b}$
A.
$2n$
B.
$n+1$
C.
$n-1$
D.
$2n+1$
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