Indiana Code Title 23. Business and Other Associations § 23-17-15-5

Sec. 5. (a) Except as otherwise provided in this article, articles of incorporation, or bylaws, a quorum of a board of directors consists of a majority of the directors in office immediately before a meeting begins.  Articles of incorporation or bylaws may not authorize a quorum of fewer than the greater of the following:

(b) If a quorum is present in person when a vote is taken, the affirmative vote of a majority of directors:

when the act is taken is the act of the board of directors unless this article, articles of incorporation, or bylaws require the vote of a greater number of directors.