A) \[3\,\,m\,\,{{s}^{-1}},\,\,6\,\,m\,\,{{s}^{-2}}\]
B) \[7\,\,m\,\,{{s}^{-1}},\,\,4\,\,{{s}^{-2}}\]
C) \[7\,\,m\,\,{{s}^{-1}},\,\,6\,\,m\,\,{{s}^{-2}}\]
D) \[7\,\,m\,\,{{s}^{-1}},\,\,3\,\,m\,\,{{s}^{-2}}\]
Correct Answer: C
Solution :
\[{{S}_{n}}=(4+6n)\] ? (1) \[{{S}_{n}}=u+\frac{a}{2}(2n-1)=\left( u-\frac{a}{2} \right)+an\] ? (2) Comparing (1) and (2), we get\[u=7\,\,m\,\,{{s}^{-1}}\]and\[a=6\,\,m\,\,{{s}^{-2}}\]
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