The nth term of an AP is given by 2n+ 3. Find the first three terms hence show that the sum of the...

The nth term of an AP is given by 2n+ 3. Find the first three terms hence show that the sum of the first n terms is given by Sn = n² + 4n

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Kavungya answered the question on September 18, 2019 at 13:27

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