Mass. Gen. Laws ch. 156B, § 57: Quorum at directors' meeting

Section 57. Unless otherwise provided in the by-laws, the number of directors required to constitute a quorum shall be a majority of the directors then in office. If a quorum is present, a majority of the directors present may take any action on behalf of the board except to the extent that a larger number is required by law or the articles of organization or the by-laws.