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"Antimatter" is not negative mass. Mass is a positive quantity for both matter and antimatter. So gravity is always attractive, even if one of the masses in the relationship happens to be antimatter.

If such a thing as negative mass exists, then the forces between it and a lump of normal mass would be repulsive ones. Antimatter is observed routinely, but no evidence of negative mass has ever been observed.

When matter & antimatter annihilate energy is released per E = mc2 where m corresponds to the sum of their masses. If the antimatter had negative mass then instead of a positron/electron annihilation releasing energy corresponding to twice the electron mass (as it does) the mass of the electron and negative mass of the positron would cancel resulting in no energy release (this does not happen). This proves that both matter & antimatter have positive mass, without even referring to gravity. As they both have positive mass their gravity will be attractive not repulsive.

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