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We discuss the entropy and the transformation properties of classicalextremal N=2 black hole solutions in supergravity theories associated with theminimal coupling models CP(n-1,1). The entropy is given by a manifestlyinvariant quantity under the embedding of the duality group SU(1,n) intoSp(2n+2) which is a symmetry of the classical BPS mass formula.Comment: 8 pages, Late

Classical Entropy of N=2 Black Holes: The Minimal Coupling Case