1.

If (""^(n)C_(r)+3""^(n)C_(r+1)+3""^(n)C_(r+2)+""^(n)C_(r)+3)/(""^(n)C_(r)+4""^(n)C_(r+1)+6""^(n)C_(r+2)+4""^(n)C_(r+2)+4""^(n)C_(r+3)+""^(n)C_(r)+4)=(r+k)/(n+k) ,then the value of k equals

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1
2
4
None of these

Answer :C


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