The number of solutions (P,Q) of the equation \displaystyle\frac PQ-\frac QP=\frac{P+Q}{PQ}, where P and Q are integers from 1 to 9 inclusive, is
Answer Choices
A. 1
B. 8
C. 16
D. 72
E. 81
The number of solutions (P,Q) of the equation \displaystyle\frac PQ-\frac QP=\frac{P+Q}{PQ}, where P and Q are integers from 1 to 9 inclusive, is
Answer Choices
A. 1
B. 8
C. 16
D. 72
E. 81