1.

Factorisation of \[xy-pq+qy-px\]is ______.

A.  \[(y-p)(x+q)\] 
B.  \[(y-p)(x-q)\]
C.         \[(y+p)(x+q)\]
D.         \[(y+p)(x-q)\] 
Answer» B.  \[(y-p)(x-q)\]


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