Question

Find an A.P. the sum of whose first n terms is
2n² + n.​

Answer 1

Answer:

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Answer 2

Answer:

▶Here's your answer

⏩Let n be 1 so

$2 ({1}^{2} ) + 1 = 2 + 1 = 3$

▶First term is 3...

⏩Let n be 2

$2( {2}^{2} ) + 1 = 8 + 1 = 9$

▶Second term is 9

⏩Let n be 3

$2( {3}^{2} ) + 1 = 18 + 1 = 19$

▶Let n be 4

$2( {4}^{2} ) + 1 = 32 + 1 = 33$

➡AP FORMED : 3,9,19,33

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