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If ^2n+1P(n-1):^(2n-1)Pn=3:5, then find ...

If `^2n+1P_(n-1):^(2n-1)P_n=3:5,` then find the value of `ndot`

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`.^(2n+1)P_(n-1): .^(2n-1)P_(n)=3:5`
or `(.^(2n+1)P_(n-1))/(.^(2n-1)P_(n))=(3)/(5)`
or `((2n+1)!)/((n+2)!)xx((n-1)!)/((2n-1)!)=(3)/(5)`
or `((2n+1)(2n))/((n+2)(n+1)n)=(3)/(5)`
or `10(2n+1)=3 (n+2)(n+1)`
or `3n^(2)-11n-4=0`
or (n-4)(3n+1)=0
or n=4
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