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" If "P(n-1,3):P(n,4)=1:9" find "n...

" If "P(n-1,3):P(n,4)=1:9" find "n

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13. If P(n-1,2):P(n,4)=1:9, find n

If P(n-1,3):P(n+1,3)=5:12,"Find "n .

If P(n-1,3):P(n+1,3)=5:12 , find n.

If P(n ,5): P(n ,3)=2:1 find n

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If ""^(n-1)P_(3): ""^(n)P_(4)=1:9 find n.

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If "^nP_4: ^(n+1)P_4=3:4 , find n.