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(i) If .^(20)C(r)=.^(20)C(r+6), find r. ...

(i) If `.^(20)C_(r)=.^(20)C_(r+6)`, find r.
(ii) If `.^(18)C_(r)=.^(18)C_(r+2)`, find `.^(r)C_(5)`.

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