Answer
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).
