A P \text { , the sum of } n \text { terms is } \frac { 1 } { 2 } \lef – InterviewSolution

1.	A P \text { , the sum of } n \text { terms is } \frac { 1 } { 2 } \left( 5 n ^ { 2 } + 3 n \right) . \text { Find its } 40 ^ { \text { th } }
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