Question

If X= {a, b, c, d} and Y= { f, b, d, g}, find X - Y

Answer 1

concept :- A - B shows the relative complement of the set, which represents members of set A which are not part of set B. see figure , here shaded region is shown, this shaded region indicates A - B.

here, X = {a, b, c , d} and Y = {f, b, d, g}
so, X - Y = {a, b, c, d} - {f, b, d, g}
here you can see that b, d are present in both sets. so, X - Y won't contain b , d and will contain rest elements of X.

hence, X - Y = {a, c}

Answer 2

Solution :

Given X = { a, b , c , d }

Y = { f , b , d , g }

X-Y = {x:x€X and x doesn't belongs to Y}

= { a , b , c , d } - { f , b , d , g }

= { a , c }

••••