\left\{ \begin{array} { l } { 11 = a _ { 1 } + ( n - 1 ) 2 } \\ { 3,5 = \frac { n ( a _ { 1 } + 1 ) } { 2 } } \end{array} \right.
Solve for a_1, n
a_{1}=\sqrt{35}+6\approx 11.916079783\text{, }n=\frac{7-\sqrt{35}}{2}\approx 0.541960108
a_{1}=6-\sqrt{35}\approx 0.083920217\text{, }n=\frac{\sqrt{35}+7}{2}\approx 6.458039892
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