O Rh + it is considered lucky because it is a general norm group.O Rh-rare when an accident, if you want to use this blood group blood. very rare, there are no book as well. General Mills.
O Rh + is considered lucky because a group of normal O Rh- rare accident of time if you want to use the blood. Blood is extremely rare. There is no provision under the general hospitals.
O Rh is considered lucky because a group of normal O Rh - hard to find the time if you want to use blood accidents. This blood type is rare. No reserves in general hospital