Question

If Sn= n2 +2n then find Tn?​

Answer 1

Answer:

Hey mate here is your answer

$s_{n} = {n}^{2} + 2n \\ \\ = t _{n = } \: s_{n} - s_{n} - 1 \\ \\ = {n}^{2} + 2n - ({n - 1})^{2} + 2(n - 1) \\ \\ = {n}^{2} + 2n - {n}^{2} + 2n - 1 + 2n - 2 \\ \\ = 6n - 3 \: (ans) \\ \\ hey \: pls \: mark \: me \: as \: brainlist \: and \: follow \:me$

Answer 2

Answer:

please mark me as brainlist