Discrete Mathematics and its Applications (7th Edition)

p126  2.1.17, 2.1.21, 2.1.46
p136  2.2.17, 2.2.39, 2.2.46
p152  2.3.16, 2.3.21, 2.3.38
p169  2.4.7, 2.4.19, 2.4.38
p176  2.5.28, 2.5.40