IF Sn denote the sum of the first n terms of an AP and S2n =3Sn ,then S3n :Sn is equal to what no.?

IF Sn denote the sum of the first n terms of an AP and S2n =3Sn ,then

1.	IF Sn denote the sum of the first n terms of an AP and S2n =3Sn ,then S3n :Sn is equal to what no.?
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