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" If "15P(r)=32760," then "r=...

" If "15P_(r)=32760," then "r=

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If .^(15)P_(r)=2730 , then the value of r will be -

(i) If ""^(15)P_(r)=2730, find the value of r. (ii) If ""^(10)P_(r)=5040, find the value of r.

15P_(r-1):^(15)P_(r-2)=3:4, then r=

IF ""^(15)P_(r-1):""^(16)P_(r-2) = 3 : 4 then r=

IF ""^(15)C_(r+3)=""^(15)C_(2r-3) , then r=

If "^15P_r : "^16P_r = 3:4 then r =

If 15C_(3r) = 15C_(r+3) than r = '

IF ""^(20)P_(r):""^(20)P_(r-1)=15 :1 then r=

If ""^15C_(3r)=""^(15)C_(r+3) , then find r .