both set have 4 elements, meaning that they are equivalent. since the question is asking whether they are equal we have to confirm if the sets have equal numbers of and the same elements. since the two sets satisfy the conditions, the answer is yes, the sets are equal.
yeah, the sets (p, q, r, s) and {q, s, r, p} are equal. the order of elements does not matter in a set, so as long as they contain the same elements, regardless of the order, they are considered equal :)
