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

[" (ii) If "n+[C_(r+1):^(n)C_(r):n-1C_(r-1)=11:6:3," find "n" and "r.],[" Yuil/ Find "n" if "^(n)C_(4)^(n)C_(5'),^(n)C_(6)" are in A.P."]

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