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(i) If ""^(5)P(r)=2xx""^(6)P(r-1), find...

(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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