tolong di jawab pliss a dan b

a={1,2,3,4}
b={4,5,6,7}
c={6,7,8,9}

jawab=
a=(a(irisan dari) b) (gabung) (b (irisan dari) c)
= {4} gabung{ 6,7}
={4,6,7}

b. (a (gabung) c) (irisan) (a(gabung) b)
={1,2,3,4,6,7,8} (irisan) (1,2,3,4,5,6,7)
= {1,2,3,4,6,7}
(maaf klo slh)