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0^0, in some sources equals to 1, some mathematicians say it's undefined. You won't need this for GMAT.
During the past decade, mathematicians argued extensively about the value of 0^0. Some answer that 0^0 = 1, while others answer that 0^0 is undefined. In the unlikely event that this question appears in some format or is a required intermediary calculation, the correct answer is more likely that 0^0 = 1. http://www.platinumgmat.com/gmat_study_ ... ial_powers