A) \[4n+3\]
B) \[4n+5\]
C) \[4n+7\]
D) \[4n+6\]
Correct Answer: A
Solution :
Sum of n terms, \[{{S}_{n}}=2{{n}^{2}}+5n\] \[{{T}_{n}}={{S}_{n}}-{{S}_{n-1}}\] \[=2{{n}^{2}}+5n-[2{{(n-1)}^{2}}+5(n-1)]\] \[=2{{n}^{2}}+5n-2{{n}^{2}}-2+4n-5n+5\] \[=4n+3\]
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