in some cases 4. In some others 5.
https://math.stackexchange.com/questions/775273/contradiction-prove-22-5
Here is another one
http://www.businessinsider.com/2--2-doesnt-always-equal-4-2014-6
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in some cases 4. In some others 5.
https://math.stackexchange.com/questions/775273/contradiction-prove-22-5
Here is another one
http://www.businessinsider.com/2--2-doesnt-always-equal-4-2014-6