# play with functions 2

Algebra Level 5

If $$f(x)$$ is a function such that

$f(x-1) + f(x+1) = \sqrt{3} \times f(x)$

and $$f(5)$$ = 10 , then what is the sum of digits of

$\sum_{i=0}^{19} f(5 + 12i ) ?$

Also try solving playwithfunctions3

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