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[" If "^(n+1)C(r+1):^(n)C(r):^(n-1)C(r-1...

[" If "^(n+1)C_(r+1):^(n)C_(r):^(n-1)C_(r-1)=11:6:3," then "nr=],[" (A) "20],[" (B) "30]

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