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" If "^(18)P((r-1)):^(17)P((r-1))=9:7," ...

" If "^(18)P_((r-1)):^(17)P_((r-1))=9:7," find "r

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If ""^(15)P_(r-1): ""^(16)P_(r-2)=3:4 , find r.

If ""^(22)P_(r+1):^(20)P_(r+2)=11:52, find r.

If ""^(22)P_(r+1):""^(20)P_(r+2)=11:52, 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.

(a) If .^(22)P_(r+1):^(20)P_(r+2)=11 : 52 , find r. (b) If .^(56)P_(r+6):^(54)P_(r+3)=30800: 1 , find r.

(a) If .^(22)P_(r+1):^(20)P_(r+2)=11 : 52 , find r. (b) If .^(56)P_(r+6):^(54)P_(r+3)=30800: 1 , find r.

If ^(56)P_(r+6):^(54)P_(r+3)=30800:1, find r

If ^(56)P_(r+6):^(54)P_(r+3)=30800 :1, find r .

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

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