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If (9 + sqrt80)^n =I+f, where I, n are ...

If `(9 + sqrt80)^n =I+f`, where `I, n` are integers and `0 lt f lt 1` : (A) ` I` is an odd Integer (B) `I` is even integer (C) `(I+f) (1-f)=1` (D) `1-`f=`(9-sqrt 80)^n`

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