Zero to the power of zero said to be the same as 1
Zero to the power of zero, denoted by 00, is a mathematical expression that is either defined as 1 or left undefined, depending on context.  In algebra and combinatorics, one typically defines  00 = 1.  In mathematical analysis, the expression is sometimes left undefined. Computer programming languages and software also have differing ways of handling this expression.The interpretation of b0 as an empty product assigns it the value 1.
The combinatorial interpretation of b0 is the number of 0-tuples of elements from a b-element set; there is exactly one 0-tuple.
The set-theoretic interpretation of b0 is the number of functions from the empty set to a b-element set; there is exactly one such function, namely, the empty function.All three of these specialize to give 00 = 1.
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