Problem Set 1.1.    1 (d) and  (e), 2 (c) ,  4 and 6.

Problem Set 1,2.    1 (c), 3 (b) and (c), 5, 7 (b) and (f).

Problem Set 1.3.    1 (c), 3, 4, 5 (b) and (e), 6, 8.

Problem Set 1.4.    1 (c), 2, 4, 5 (c), 6.

Problem Set 1.5.    1 (a), (c), (f), 2 (d), 5, 7, 9.

Problem Set 1.6.     4.

Problem Set 1.7.     3 (a), (d), (f).

Problem Set 1.8.     2 (b), 6 (e), (f).

Problem Set 2.1.     3, 4, 5.

Problem Set 2.2.     1 (a)-(c), 3, 9, 10 (a), 11.

Problem Set 2.6.     1 (a), (c), (d), 2, 3.

Problem Set 2.7.     1, 2, 3, 4.

Problem Set 2.10.    1 (b), (c) 3, 4 (a), (b), (d), (f).