Chapter 2 - Set Theory - 2.1 Basic Set Concepts - Exercise Set 2.1 - Page 59: 88

a. yes b. no

$A = \{x|x ∈ N$ and $12 \lt x \leq 17\}$ $B = \{x|x ∈ N$ and $20 \leq x \lt 25\}$ Expressed using the roster method: $A = \{13, 14, 15, 16, 17\}$ $B = \{20, 21, 22, 23, 24\}$ a. Those sets are equivalent as they have the same number of elements. b. Those sets aren't equal, as their elements are not all the same.