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If a1, a2, a3, … are in HP and f(k) = ∑ar - ak , for r ∈ [n, r = 1] then f(1)/a1 , f(2)/a2,f(3)/a3, ... , f(n)/an are in

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If a1, a2, a3, … are in HP and f(k) = ∑ar - ak , for r ∈ [n, r = 1]  then f(1)/a1 , f(2)/a2,f(3)/a3, ... , f(n)/an  are in

(A)  AP 

(B)  GP

(C)  HP 

(D)  None of these

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Correct option (A) AP

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