A) \[{{S}_{n}}\]of the arithmetic progression 3, \[13,23,....\]is\[5{{n}^{2}}-8n\].
B) \[{{S}_{n}}=3{{n}^{2}}-8n\]is the sum of an arithmetic progression whose common difference is 6.
C) \[{{n}^{th}}\]term, \[{{t}_{n}}={{s}_{n}}-{{s}_{n-1}}\]
D) The\[{{n}^{th}}\]term of an arithmetic progression is \[{{t}_{n}}=a+(n-1)d\].
Correct Answer: A
Solution :
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