{(1,2), (3,5)} is a partition of {1,2,3,4,5}?
A partition of the set A is the set of subsets of A, such that it doens't contain an empty set, their unification is equal to A and the intersection of any two elements is an empty set.
. So, {(1,2), (3,5)} is not a partition of {1,2,3,4,5}
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