If pq+qr+rp=0 then find the value of $$ {p^{2} over {p^{2}-qr}}+{q^{2} over {q^{2}-rp}}+{r^{2} over {r^{2}-pq}}$$

If pq+qr+rp=0 then find the value of $$ {p^{2} over {p^{2}-qr}}+{q^{2}

1.	If pq+qr+rp=0 then find the value of $$ {p^{2} over {p^{2}-qr}}+{q^{2} over {q^{2}-rp}}+{r^{2} over {r^{2}-pq}}$$
A.	0
B.	1
C.	-1
D.	3
Answer» C. -1