A) \[3\,(p-q)\,\,(q-r)\,\,(r-p)\]
B) \[3\,(p+q)\,\,(q+r)\,\,(r+p)\]
C) \[4\,(p+q)\,\,(4q+9r)\,\,(r+p)\]
D) \[3\,\,(-\,2p+z)\,\,(z+r)\,\,(r+2p)\]
E) None of these
Correct Answer: A
Solution :
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