Question

If for a sequence, (,), Sn = 2n2 + 5n then t, is
(1) n + 3
(2) 2n + 3
(3) 4n + 3
(4) 5n - 2​

Answer 1

Answer:

Tn=Sn−Sn−1

=2n2+5n−[2(n−1)2+5(n−1)]

=2n2+5n−2n2−2+4n−5n+5

∴Tn=4n+3

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Answer 2

Answer:

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