5anan+1=anan+15 a_n a_{n+1}=a_n - a_{n+1}

Calculus Level 2

The sequence {an}\{a_n\} satisfies a1=1a_1 = 1 and 5anan+1=anan+1 for n1.5 a_n a_{n+1}=a_n - a_{n+1} \text{ for } n \geq 1. What is the value of a11?a_{11}?

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