JEE Advanced 2020 Full Test 3 Paper 1

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Question : 42 of 54

Marks: +1, -0

If (9+√80)n=1+f where ∣ and n are integers and 0<f<1, then

I is an odd integer
I is an even integer
(1+f)(1−f)=1
1−f=(9−√80)n

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