if the concentration of a substance at the surface of another substance is more than in the bulk of the adjoining phases, it is called positive surface.
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Negative * positive = negative Positive * positive = positive Negative * negative = positive
positive and a positive is a positive negative and a negative is a positive to answer your question: positive and a negative is a negative.
Negative * positive = negative Positive * positive = positive Negative * negative = positive
a positive
A positive.