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We consider the Bekenstein-Hawking entropy-area formula in four dimensionalextended ungauged supergravity and its electric-magnetic duality property.Symmetries of both "large" and "small" extremal black holes are considered, aswell as the ADM mass formula for N=4 and N=8 supergravity, preserving differentfraction of supersymmetry. The interplay between BPS conditions and dualityproperties is an important aspect of this investigation.

Duality, Entropy and ADM Mass in Supergravity