Mont. Code Ann. § 28-1-301
Types of obligations involving several persons
28-1-301 . (Temporary) Types of obligations involving several persons. Except as provided in 27-1-703 , an obligation imposed upon several persons or a right created in favor of several persons may be:
(1) joint;
(2) several; or
(3) joint and several. (Terminates on occurrence of contingency--sec. 11(2), Ch. 429, L. 1997.)