1.

If \[\frac{1}{p}-\frac{1}{q}-\frac{1}{r}=\frac{1}{18}\] and \[pq\text{ }+\text{ }qr\text{ }=\text{ }pr\]then find the value of r.

A. 0      
B. 1  
C. 18    
D. -36
E. None of these
Answer» E. None of these


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