Doubt on value of the expression

#1

Bhaiya, should E(X) be like this?
E(X)=n(1 + i/(n-1) + 1/(n-2) + 1/(n-3) +…+1)

#2

yes it should be this.

#3

its easy to write it like (n+n/2+n/3+n/4…n/n)

#4

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