a) A={1,2,3,5,8},B={3,4,5,6,7}
A∪B ={1,2,3,4,5,6,7,8}
A∩B={3,5}
b)A={4,5},B={5,4,3,2,1}
A∪B={1,2,3,4,5}
A∩B={4,5}
c)A={0,3,6,9,...,30},B={0,6,12,...,30}
A∪B={0,3,6,9,12,...27,30}
A∩B={0,6,12,...,30}
d)A={2,4,6,...,20},B={1,3,5,...,19}
A∪B={1,2,3,4,...18,19,20}
A∩B=∅