If $x$ is real and $k = \frac{{{x^2} - x + 1}}{{{x^2} + x + 1}},$ then
If $x$ is real and $k = \frac{{{x^2} - x + 1}}{{{x^2} + x + 1}},$ then
- A
$\frac{1}{3} \le k \le 3$
- B
$k \ge 5$
- C
$k \le 0$
- D
None of these
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