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" 13.If "^(56)P(r+6):^(54)P(r+3)=30800:1...

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

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(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 , then the value of r is

If ""^(56)P_(r+6) : ""^(54)P_(r+3)= 30800, then r is

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