Sum of first n terms is 3n+ n. Find the 22nd Term.


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Sn = 3n2 + n 

S22 = 3(22)2 + 22

S22 = 1452 + 22 ∴ S22 = 1474

S21 = 3(21)2 + 21

S21 = 1344

a22 = S22 - S21 

∴ a22 = 1474 - 1344 ∴ a22 = 130

Hence, the 22nd term of A.P is 130

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