MCQ
In which of the following, function $f(x)=x^2-4 x$ +6 is increasing :
- A$(-\infty, 2) \cup(2, \infty)$
- B$(2, \infty)$
- C$(-\infty, 2)$
- D$(-\infty, 2] \cup(2, \infty)$
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