If for an A-P- Sn-n2-7 n what is its third term-A- 12B- 20C- 15D- 21

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Algebra of Sequences

If for an A.P...

Question

If for an A.P. S_n=n²+7n what is its third term?

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If for an A.P. S_n=n² + 3n
What is the n^th term?

\frac{S_{m}}{S_{n}} = \frac{m^{2}}{n^{2}}

\frac{t_{m}}{t_{n}} =

n - t h

= 7 n + 4,

S_{n} = \frac{n}{2} (7 n + 15)

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