if Sn denote the sum of n terms and S2n=3Sn,find the value of S3n:Sn
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given ,
2n(2a+2nd-d)/2=3n(2a+nd-d)/2
from here we get common difference (d)=2a/n+1
put it in given questions and you will find-------
s3n:sn=6:1
2n(2a+2nd-d)/2=3n(2a+nd-d)/2
from here we get common difference (d)=2a/n+1
put it in given questions and you will find-------
s3n:sn=6:1
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