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a
(−∞,12)∪(1,2)
b
1,2
c
(−1,∞)
d
R−1,2
answer is A.
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Detailed Solution
The domian of the funciton is the set of all real numbers for which x-1x-22x-1>0The graph of above function intersect x - axis at x=1, 2, 12Use the sign changes on the number line, we can decide where the function is positve Hence, the domain is -∞,12∪1.2