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

" 4.(i) If "^(5)P_(r)=2times^(6)P_(r-1)" ,find "r

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Iff ""^(5)P_(r)=""^(6)P_(r-1) find r.

(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.

Find r if ""^(5)P_(r)=2""^(6)P_(r-1)

Find r if ""^(5)P_(r)=2""^(6)P_(r-1)

Find r if ""^(5)P_(r)=2""^(6)P_(r-1)

Find r if ""^(5)P_(r)=2""^(6)P_(r-1)

Find r if ""^(5)P_(r)=""^(6)P_(r-1)

Find r if ""^(5)P_(r)=""^(6)P_(r-1)

Find r if ""^(5)P_(r)=""^(6)P_(r-1)