Let x1, x2,...,xn be positive real numbe...

Let `x_1, x_2,...,x_n` be positive real numbers and we define `S=x_1+x_2+.....+x_ndot` Prove that `(1+x_1)(1+x_2)...(1+x_n)lt=1+S+(S^2)/(2!)+(S^3)/(3!)+...+(S^n)/(n !)`

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