If Sr denotes the sum of first r terms of an AP then, S3n:(S2n-Sn) is

1.	If Sr denotes the sum of first r terms of an AP then, S3n:(S2n-Sn) is ???
Answer» a n s w e rGiven that :\xa0Sn is sum of first n terms of an A.P.Let a be the first term and d be the common difference of the given A.P.Then,

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