Y- X ={u, n,g } and n(YUX) = 8
6) To enlist all the elements of Y-X we need to write down the elements that belong to Y and not to X:
Y- X ={u, n,g }
b) To find the number of elements of the Union between those two sets we need to enlist all of the elements from both sets without repeating them:
Let's firstly enlist the Union:
Y ∪ X = {a, b, d, e, g, h, u, n}
Counting the elements we can write:
n(YUX) = 8
Hence, the answers are:
Y- X ={u, n,g } and n(YUX) = 8