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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 |
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Answer» 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 |
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