Question

If X = {11, 12, 13, 14, 15} & Y = {13, 15, 17, 18}, find
a) Y-X
b) n (X-Y)
guys its urgent if u know please help me​

Answer 1

Answer:

Y-X = {17 , 18}

X-Y = {11 ,12, 14}

so, n(X-Y) = 3

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