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let f: A to A, where A is a set of non-n...

let f: A `to` A, where A is a set of non-negative integers and satisfying the condition.
(i) `x-f(x)=19[x//19]-90[f(x)//90],AAxinA`
(ii) `1900ltf(1990)lt2000`
then f(1990) equals, (where [.] denote greatest integer function)

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