If Sr denotes the sum of r terms of an A...

If `S_r` denotes the sum of r terms of an A.P. and `S_a/a^2=S_b/b^2=c`. Then `S_c=` (A) `c^3` (B) `c/ab` (C) `abc` (D) `a+b+c`

`c ^(2)`

`c ^(3)`

`c ^(4)`

`abc`

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