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[" 17.If "^(r)C(m)=^(n+1)C(m+1)," then "...

[" 17.If "^(r)C_(m)=^(n+1)C_(m+1)," then "sum_(r=m)^(n)(n-r+1)^(r)C_(m)" is equal to "],[[(A)^(n+3)C_(m+2)," (B) "^(n+2)C_(m+2)],[" (C) "^(n+2)C_(m+1)," (D) none of these "]]

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