# Riemann zeta function.

Calculus Level 4

Find the value of $$\sum _{ n=1 }^{ \infty }{ \frac { \zeta (2n)-1 }{ { 2 }^{ 2n } } }$$. Answer is in $$\frac { a }{ b }$$ form where $$a$$ and $$b$$ are relatively prime. Write answer as $$a+b$$.

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