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The binding energies of the atoms of elements X and Y are Ex and Ey respectively. Three atoms of the element Y fuse to give one atom element X. This fusion process is accompained by release of energy U. Then Ex, Ey and U are related as :- (1)Ex = 3Ey (2)Ex = 3Ey + U (3)Ex = 3Ey – U (4)x + 3Ey + U = 0