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Question
The sum of first n terms of an AP is (4n2 + 2n). The nth term of this AP is ______.
Options
(6n – 2)
(7n – 3)
(8n – 2)
(8n + 2)
MCQ
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Solution
The sum of first n terms of an AP is (4n2 + 2n). The nth term of this AP is (8n – 2).
Explanation:
Tn = (Sn – Sn – 1)
= (4n2 + 2n) – {4(n – 1)2 + 2(n – 1)}
= (4n2 + 2n) – (4n2 – 6n + 2)
= (8n – 2)
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