# Chapter 2 - Set Theory - 2.1 Basic Set Concepts - Exercise Set 2.1: 85

a. no b. yes

#### Work Step by Step

$A = \{1, 1, 1, 2, 2, 3, 4\}$ $B = \{4, 3, 2, 1\}$ a. Those sets aren't equivalent as they have a different number of elements. b. Those sets are equal because their unique elements are exactly the same ( $1, 2, 3, 4$ for both).

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