Sec. 7. (a) If the articles of incorporation or this article provide for voting by a single voting group on a matter, action on that matter is taken when voted upon by that voting group as provided in section 6 of this chapter.
(b) If the articles of incorporation or this article provide for voting by two (2) or more voting groups on a matter, action on that matter is taken only when voted upon by each of those voting groups counted separately as provided in section 6 of this chapter. A matter may be voted on by one (1) voting group even though no vote is taken by another voting group entitled to vote on the matter.