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If a1, a2, a3, an are in H.P. and f(k)=...

If `a_1, a_2, a_3, a_n` are in H.P. and `f(k)=(sum_(r=1)^n a_r)-a_k ,t h e n` `(a_1)/(f(1)),(a_2)/(f(2)),(a_3)/(f(3)), ,(a_n)/(f(n)),` are in a. A.P b. G.P. c. H.P. d. none of these

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