Determine whether each of these integers is prime a) 2 1 b) 2 9 c) 7 1 d) 9 7 e) 1 1 1 f) 1 4 3 Calculate a) GcD (12, 18) b) GcD (33,44 ) c) GcD (21,55) d) LcM (10, 15)