we have
A{1,3,7,9,10}
B{2,5,7,8,10}
C{1,3,7,8,9,10}
part 1
AUB={1,3,7,9,10} U{2,5,7,8,10}={1,2,3,5,7,8,9,10}
A∩B={1,3,7,9,10}∩{2,5,7,8,10}={7,10}
AUC={1,3,7,9,10} U {1,3,7,8,9,10}={1,3,7,8,9,10}
Part 2
X{1,3,7,9,10}
Y{2,5,7,8,10}
Z{0,1,3,10}
XUY={1,3,7,9,10} U {2,5,7,8,10}={1,2,3,5,7,8,9,10}
XUY ∩ Z={1,2,3,5,7,8,9,10} ∩ {0,1,3,10}={1,3,10}
Step-by-step explanation
we have
XUY ∩ Z
but remember that
XUY={1,3,7,9,10} U {2,5,7,8,10}={1,2,3,5,7,8,9,10}
so
XUY ∩ Z={1,2,3,5,7,8,9,10} ∩ Z={1,2,3,5,7,8,9,10} ∩ {0,1,3,10}
and
{1,2,3,5,7,8,9,10} ∩ {0,1,3,10}={1,3,10}