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

" (i) If "^(20)C_(r)=^(20)C_(r+6)" ,find "r

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(i) If ""^(5)P_(r)=2xx""^(6)P_(r-1) , find r. (ii) If ""^(20)P_(r)=13xx""^(20)P_(r-1) , find r. (iii) If ""^(11)P_(r)=""^(12)P_(r-1) , find r.

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