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A simple question but causing...

A simple question but causing me angst...I want a cell to be the product of four other cells...Cell A5 = A1*A2*A3*A4...easy enough but I do not always have four entries and if I do not fill in all four cells i do not get a result. So my question is how do I specifiuy that a cell with no entry = the value of 1 in this case??

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