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If H1, H2, ,H(20)a r e20 harmonic means...

If `H_1, H_2, ,H_(20)a r e20` harmonic means between 2 and 3, then `(H_1+2)/(H_1-2)+(H_(20)+3)/(H_(20)-3)=` a. 20 b.21 c. 40 d. 38

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