1.

Formula of sum of AP

Answer» Sn=n/2[2a+(n-1)d]
Sn= n/2(2a+(n -1)d)
Sn = n/2(a+l)
If the last term is given we should use sn=n/2(2a+(n-1)d)
Sn =n/2(2a+(n-1))d


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