#### Answer

a) Both sets are equal
b) The two sets are not equal
c) The two sets are not equal

#### Work Step by Step

a) The 2 sets are equals because they both have the same elements: 1, 3 and 5. It is important to note that the order and repetitions of some elements do not matter.
b) The first set has 1 set as an element. The second set has the element 1 and 1 set as elements. So they are not equals (1 element versus 2 elements)
c) The first one is an empty set, it has nothing, or 0 elements. The second set is a set of 1 element (The element in that set is an empty set). (0 element versus 1 element). So they are not equal.