ind the commonNCERT)ample2. 1 the sum ofn terms ofan Đ.Đ.is (pn+qn

1.	ind the commonNCERT)ample2. 1 the sum ofn terms ofan Đ.Đ.is (pn+qn)where pand q are constantciridifference
Answer» Given ,Sn=pn +qn^2 we know ,Tn =Sn - S(n-1) where Tn is nth term of AP so,Tn = pn+qn^2- q(n-1)^2-p(n-1) = q(n^2-n^2+2n-1)+p (n-n+1)= q(2n-1)+phence ,Tn = q(2n-1)+p put n=1, T1 = q+pn=2, T2 = 3q +p common difference =T2-T1 = 3q+p-q-p = 2qhence ,common difference =2q

ind the commonNCERT)ample2. 1 the sum ofn terms ofan Đ.Đ.is (pn+qn)where pand q are constantciridifference

Answer»

Given ,Sn=pn +qn^2

we know ,Tn =Sn - S(n-1)

where Tn is nth term of AP so,Tn = pn+qn^2- q(n-1)^2-p(n-1) = q(n^2-n^2+2n-1)+p (n-n+1)= q(2n-1)+phence ,Tn = q(2n-1)+p

put n=1, T1 = q+pn=2, T2 = 3q +p

common difference =T2-T1 = 3q+p-q-p = 2qhence ,common difference =2q