A) \[p\ne q\]
B) \[q\ne r\]
C) \[r\ne p\]
D) \[p=q=r\]
Correct Answer: D
Solution :
\[f(x)=|px-9|+r|x|,x\in (-\infty ,\,\,\infty )\] Where \[p>0,\] \[q>0\]and \[r>0\]can assume its minimum value only at one point, if \[p=q=r\].
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