If Sn be the sum of n terms of an AP and Spn/Sn is independent of n then the common difference is?
u r answer is zero let a a+d a+2d .....be in AP then sum of first term is a sum of first two terms is a+a+d=2a+d
d=sum of first two terms-twice of sum of first term=2a+d-2a=d
similarly sn as spn/sn first term is sp/s second term is 2sp/2s=sp/s
d=sp/s+sp/s-twice of sp/s=2sp/s-2sp/s=0
therefore common difference d=0
d=sum of first two terms-twice of sum of first term=2a+d-2a=d
similarly sn as spn/sn first term is sp/s second term is 2sp/2s=sp/s
d=sp/s+sp/s-twice of sp/s=2sp/s-2sp/s=0
therefore common difference d=0
