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an=an−1+an+1a_{n}=a_{n-1}+a_{n+1}an=an−1+an+1 for n≥1n\geq1n≥1
a0=a1=0a_{0}=a_{1}=0a0=a1=0
Find ∑n=1∞an=?\sum_{n=1}^{\infty} a_{n} =?n=1∑∞an=?
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