If x1,x2,x3 and x4 are positive real nu...

If `x_1,x_2,x_3 and x_4` are positive real numbers such that `x_1 x_2 x_3 x_4= 1`, then the least value of `(1+x_1)(1 + x_2)(1+x_3)(1+x_4)` is

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