Let f:NrarrN be a function such x-f(x)=1...

Let `f:NrarrN` be a function such `x-f(x)=19[(x)/(19)]-90[(f(x))/(90)],AAx in N` , where [.] denotes the greatest integer function and [.] denotes the greatest integers function and `1900ltf(1990)lt2000`, then possible value of `f(1990)` is

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The correct Answer is:

f(1990)=1904 or 1994

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