Intersect and conjuction

Let U={1,2,3,4,5,6}
A={1,3,5}
B={2,4,6}
C={3,6}

Find the following.
1. )AUB
2. )A'UB'

Result

X = (Correct answer is: {1,2,3,4,5,6}) Wrong answer
Y = (Correct answer is: {1,2,3,4,5,6}) Wrong answer

Solution:

U=1,2,3,4,5,6 A=1,3,5 B=2,4,6 C=3,6  X=AUB  X=1,2,3,4,5,6
A′=U−A=2,4,6 B′=U−B=1,3,5  Y=A′UB′  Y=1,2,3,4,5,6

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