19. Subject to the provisions of the next succeeding paragraph, persons to fill the seats in the Federal Assembly allotted to a Governor’s Province as general seats, Sikh seats or Muhammadan seats shall be chosen by electorates consisting of such of the members of the Legislative Assembly of the Province as hold therein general seats, Sikh seats or Muhammadan seats respectively, voting in the case of a general election in accordance with the principle of proportional representation by means of the single transferable vote :
Provided that in the North West Frontier Province the holders of Sikh seats, and in any Province in which seats are reserved for representatives of backward areas or backward tribes the holders of those seats, shall, for the purposes of this paragraph, be deemed to hold general seats.