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[" Permutations and Combinations "],[" (iii) If "n+1C_(r+1):n_(C):n-1C_(r-1)=12:6:3,],[" find the values of "n" and "r]

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" If "^(n+1)C_(r+1):^(n)C_(r):^(n-1)C_(r-1)=11:6:3," then "nr=