A) \[\frac{7}{5}\]
B) \[\frac{5}{7}\]
C) \[\frac{7}{3}\]
D) \[\frac{3}{7}\]
Correct Answer: A
Solution :
\[{{S}_{n}}=u+\frac{a}{2}(2n-1)=\frac{a}{2}(2n-1)\] because \[u=0\] Hence \[\frac{{{S}_{4}}}{{{S}_{3}}}=\frac{7}{5}\]
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