"Rule 42 '"The members of the Committee on Contributiom, no two of whom shall be nationals of the same State, shall be selccted on the basis of broad geographical representation, personal qualifications and experience, and shall serve for a period of three years corresponding to three financia! years, as defined in the Regulations for the Financia! Administration of the United Nations. Members shall retire by rotation and shall be eligible for re-election. The General Assembly shall elect the members of the Committee on Contributions at the regular session at which the term o( office of members expires, or, in case o( vacancies, at the next session."