1.

If\[x={{a}^{m+n}}{{b}^{l}},y={{a}^{n+l}}{{b}^{m}},z={{a}^{l+m}}{{b}^{n}},\]find \[{{x}^{m-n}}\times {{y}^{n-l}}\times {{z}^{l-m}}.\]

A.  0                            
B.         -1                          
C.  1                            
D.         2
Answer» D.         2


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