19. (1) Subject to the provisions of this Act, no person shall be a member of both Chambers, and rules made under this Act shall provide for the vacation by a person who is chosen a member of both Chambers of his seat in one Chamber or the other.
(2) If a member of either Chamber-
(a) becomes subject to any of the disqualifications mentioned in sub-section (1) of section 20; or
(b) by writing under his hand addressed to the Dewan resigns his seat,
his seat shall thereupon become vacant.