The union of two sets is the set that contains allelements found in at least one of the sets.
8 elements
Practice makes perfect
We are looking for number of elements in the union of the given sets.
M&={ 4, 5, - 6, 7, 8 }
N&={ - 4, 5, 6, 7, - 8}
The union of two sets is the set that contains allelements found in at least one of the sets. Therefore, the union of M and N holds all elements that are in M or N. Note that a union only contains unique values, so if any elements exist in both sets, we will cross out the duplicates.
M&={ 4, 5, - 6, 7, 8 }
N&={ - 4, 5, 6, 7, - 8}
M ⋃ N &= { - 4, 4, 5, - 6, 6, 7, - 8, 8}
The union of the sets contains 8 elements.
