1.

If set A={(r,s) | r<s; r,s∈W}, then the number of elements in set A such that 7Cr+ 7Cr−1= 8Cs is

Answer»

If set A={(r,s) | r<s; r,sW}, then the number of elements in set A such that 7Cr+ 7Cr1= 8Cs is



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