write the answer for the following expression.

WBahn

Joined Mar 31, 2012
25,115
See if you can answer that question for yourself.

You know that, in order not to be 0, there must be at least one combination of X and Y for which ALL of the factors are 1.

So start with the assumption that X = 0 and see if there are any factors that, based solely on that knowledge, are zero. There are -- the third one. So you know that it doesn't matter what any of the other variables happen to be, if X is 0 then the output is zero. How about if X = 1?
 
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