Answer:
A+2B-3 is the predicted formula when each metal cation has a charge of +2 and each non metal has a charge of -3
B2A3 is the final formula for the metal anion bonding to the non-metal cation in a 2:3 ratio.
A3B2 is the predicted formula with an overall charge of the compound being zero and each atom has 8 valence electrons in their outermost electron shell.
A3B2 is the predicted formula is made when each metal cation gains three electrons from the anion while each nonmetal loses 2 electrons to each of the cations.