Susie’s birthday is on Christmas Eve.Catherine’s is on Christmas Day.Susie answered“yesterday”on both Christmas Eve and ChristmasDay.She could not have told the truth on both days,(Otherwiseher birthday falls on two different days.)and she could not havelied on both days.(She can only tell a lie on her birthday.)Thenif her first answer had been true,the second answer could not Susie’s birthday is on Christmas Eve. Catherine’s is on Christmas Day. Susie answered “yesterday ” yesterday both "Christmas Eve and Christmas Day. She could not have told the truth on both days, (Otherwiseher birthday falls on two different days.) And she could not havelied on both days. (She can only tell a lie on her birthday.) Thenif her first answer had been true, the second answer could not