A) \[ab\,(r-1)\,\,(s-1)\,\,(s-r)\]
B) \[\frac{1}{2}\,\,ab\,(r+1)\,\,(s+1)\,\,(s-r)\]
C) \[\frac{1}{2}\,\,ab\,(r-1)\,\,(s-1)\,\,(s-r)\]
D) \[ab\,(r+1)\,\,(s+1)\,\,(r-s)\]
E) None of these.
Correct Answer: C
Solution :
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