Question: Let n=1anbe a series whose nth partial sum issn=nn+2. Find a4.(a)a4=23(b) None of these.(c)a4=121(d)a4=115(e)a4=1

Let n=1anbe a series whose nth partial sum issn=nn+2. Find a4.(a)a4=23(b) None of these.(c)a4=121(d)a4=115(e)a4=1

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