The rules for determining the isospin of two or more particles are the same as those for combining angular momentum. For example, since T = 1/2 for nucleons, the combination of two nucleons can have either T = 1 or T = 0 or may be a mixture of these isospin states. Since T₃ = +1/2 for the proton, the combination p + p has T₃ = +1 and therefore must have T = 1. Find T₃ and the possible values of T for the following:

(a) n + n
(b) n + p
(c) π⁺ + p
(d) π^- + n
(e) π⁺ + n