Establish the relation Snth =u+a/2(2n-1) where the letter have their usuasal meaning
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Snth=Sn-S(n-1)
from above equation we get that,
Snth=(un+1÷2an^2)-(u(n-1)+1÷2a(n-1)^2)
solving it you will get the term
u+a÷2(2n-1)
from above equation we get that,
Snth=(un+1÷2an^2)-(u(n-1)+1÷2a(n-1)^2)
solving it you will get the term
u+a÷2(2n-1)
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