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" If "^(n)P(7)=42^(n)P(5)," find "n...

" If "^(n)P_(7)=42^(n)P_(5)," find "n

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(i) If ""^(n)P_(5)=20xx""^(n)P_(3) , find n. (ii) If 16xx""^(n)P_(3)=13xx""^(n+1)P_(3) , find n. (iii) If ""^(2n)P_(3)=100xx""^(n)P_(2) , find n.