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Evaluate: ("lim")(nvecoo)[(n !)/(n^n)]^(...

Evaluate: `("lim")_(nvecoo)[(n !)/(n^n)]^(1//n)`

Text Solution

Verified by Experts

The correct Answer is:
`1/e`
Let `A=lim_(n to oo) [(n!)/(n^(n))]^(1//n)`
`=lim_(nto oo) ((1/xx2xx3……..n)/(nxnxxn……..n))^(1//n)`
`=lim_(nto oo)(1/nxx2/nxx3/n……..n/n)^(1//n)`
`:. logA=lim_(nto oo) 1/n["log" 1/n+"log"2/n+………+"log"n/n]`
`=lim_(nto oo) sum_(r=1)^(n)1/n"log"r/n`
`int_(0)^(1)logxdx=[x logx]_(0)^(1)-int_(0)^(1)x xx1/x dx`
`=0-int_(0)^(1)dx=0-[x]_(0)^(1)=-1`
`:.A=e^(-1)=1//e`
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