KEAM 2011 Math Paper

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Question : 73 of 120

Marks: +1, -0

If the function f:[1,∞)→[1,∞) is defined by f(x)=2x(x−1), then f−1(x) is

(
1
2
)x(x−1)
1
2
(1−√1+4log2x)
1
2
(√1+4log2x)
1
2
[1+√1+4log2x]
not defined

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