Problems 1 - 4, find, if possible, (a) A + B, (b) A- B, (c) 24, and (d) 3A-2B 1. A = [73 2]. B = 1 4] 2. A = 1 2. B - 1 23 3. A = =3 3 81. B = 12 21 4. A = [2 34 04]. B = [2 0, -5, ]