If A=1,2,3,4,5,6 B=1,3,5,7 than (AUB)'and A'UB what is value ??

Question

If A=1,2,3,4,5,6 B=1,3,5,7 than (AUB)'and A'UB what is value ??

Answer 1

AUB = {1,2,3,4,5,6,7}

(AUB)' = {2,4,6,7} not in both A and B

A' U B

A' U B = { 7}

Answer 2

if there isn't any universal set given then we assume AUB to be the universal set

AUB={1,2,3,4,5,6,7}

then (AUB)'={}

A'=(AUB)-A={7}

A'UB={1,3,5,7}=B