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[" 4.(i) If "^(20)C(r)=^(20)C(r+6)" ,fin...

[" 4.(i) If "^(20)C_(r)=^(20)C_(r+6)" ,find "r],[" (ii) If "^(19)C_(r)=^(18)C_(r+2)," find "^(r)C_(5)]

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