Section 2826. Quorums and majorities

Notwithstanding any other provision
  of this chapter  and  notwithstanding  any  provision  of  any  general,
  special  or  local  law,  whenever  the whole number of the board of any
  authority or commission heretofore or hereafter continued or created  by
  this chapter is three or more persons, a majority of the whole number of
  the  members  of  such  board, at a meeting duly held at a time fixed by
  law, or by any by-law duly  adopted  by  such  board,  or  at  any  duly
  adjourned  meeting  of  such  meeting  or  at any meeting duly held upon
  reasonable notice to all of the members of such board, shall  constitute
  a  quorum and not less than a majority of the whole number of such board
  may perform and exercise the powers  authorized  and  provided  in  this
  chapter.  For the purpose of this section the words "whole number" shall
  be construed to mean the total number which such board would  have  were
  there  no  vacancies  and  were  none  of  the  members  of  such  board
  disqualified from acting.