Neb. Rev. Stat. § 70-721: Neb. Rev. Stat. § 70-721

A majority of the board shall constitute a quorum for the transaction of business, unless a greater number is required by the articles of incorporation or the bylaws. The act of the majority of the directors present at a meeting at which a quorum is present shall be the act of the board, unless the act of a greater number is required by the articles of incorporation or the bylaws. For the purpose of determining a quorum, alternate directors shall be considered in the event of the absence, disability, disqualification, or death of any director.