If \( \mathrm{P}(\mathrm{k}, 2 \mathrm{k}), \mathrm{Q}(2 \mathrm{k}, 3 \mathrm{k}) \) and \( \ma... VIDEO
If \( \mathrm{P}(\mathrm{k}, 2 \mathrm{k}), \mathrm{Q}(2 \mathrm{k}, 3 \mathrm{k}) \) and \( \mathrm{R}(3,1) \) are collinear, then \( \mathrm{k} \) is equal to
a. -2
b. \( -\frac{1}{2} \)
c. \( \frac{1}{4} \)
d. 4
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