Geometric mean of two numbers

I need to find the geometric mean of 0 and 600. Would it just be the square root of 600? I know that the formula is $$\bar x_{\mathrm{GM}} = \left(x_1 x_2 \cdots x_n\right)^{1/n},$$ but in this case one of my values is 0, so I'm not sure.

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nop, it's 0. Geometric means is 0 whenever any single one of the x_i is not strictly positive.... – user603 Mar 22 '12 at 21:34