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" 3.Find "n" if "30P(n,6)=P(n+2,7)...

" 3.Find "n" if "30P(n,6)=P(n+2,7)

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Find n if : 30 ^nP_6= "^(n+2)P_7 .

(i) If "^((n+1))P_(5) : "^(n)P_(6)=2:7 , find n (ii) If "^(n+1)P_5 : "^(n)P_5 = 3:2 ,find n.