If pqr = 1, then find the value of \[\left( \frac{\mathbf{1}}{\mathbf{1+p+}{{\mathbf{q}}^{\mathbf{-1}}}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+q+}{{\mathbf{r}}^{\mathbf{-1}}}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+r+}{{\mathbf{p}}^{\mathbf{-1}}}} \right)\]

If pqr = 1, then find the value of \[\left( \frac{\mathbf{1}}{\mathbf{

1.	If pqr = 1, then find the value of \[\left( \frac{\mathbf{1}}{\mathbf{1+p+}{{\mathbf{q}}^{\mathbf{-1}}}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+q+}{{\mathbf{r}}^{\mathbf{-1}}}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+r+}{{\mathbf{p}}^{\mathbf{-1}}}} \right)\]
A.	\[pq+qr+rp\]
B.	1
C.	pq + qr
D.	p/q
Answer» C. pq + qr

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If pqr = 1, then find the value of \[\left( \frac{\mathbf{1}}{\mathbf{1+p+}{{\mathbf{q}}^{\mathbf{-1}}}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+q+}{{\mathbf{r}}^{\mathbf{-1}}}}\mathbf{+}\frac{\mathbf{1}}{\mathbf{1+r+}{{\mathbf{p}}^{\mathbf{-1}}}} \right)\]

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