\( \begin{array}{ll}\text { Comprehension } & \text { : If the function } f(x) \text { satisfies...
\( \begin{array}{ll}\text { Comprehension } & \text { : If the function } f(x) \text { satisfies the }\end{array} \) equation
\[
f(x+1)+f(x-1)=\sqrt{3} f(\mathrm{x}) \text { for all } x \in R,
\]
If \( \mathrm{f}(2)=9 \), find the sum \( \sum_{r=0}^{9} f(2+12 r) \)
(a) 90
(b) 91
(c) 99
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