If a,b,c be the sum of n term of three A...

If a,b,c be the sum of n term of three `A.P\'s` whose first terms are `unity` and common differences are in H.P., then n=` (A)` `(2ac+ab+bc)/(a+c-ab)` (B) `(2ac-ab-bc)/(a+c-ab)` (C) `(2ac-ab-bc)/(a+c-ab)` (D) `(2ac-ab+bc)/(a+c-ab)`

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If a,b,c be the sum of n term of three `A.P\'s` whose first terms are `unity` and common differences are in H.P., then n=` (A)` `(2ac+ab+bc)/(a+c-ab)` (B) `(2ac-ab-bc)/(a+c-ab)` (C) `(2ac-ab-bc)/(a+c-ab)` (D) `(2ac-ab+bc)/(a+c-ab)`

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