if A={x:x is a natural number less than 11}
B={x:x is a prime number less than 20}
then find A-B and B-A
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Answer:
A={2,3,5,7,11,13,17,19}
whole numbers less than 9 are, 0,1,2,3,4,5,6,7,8
B={1,3,5,7,9,11,13,15,17}
AUB={2,3,5,7,11,13,17,19}U{1,3,5,7,9,11,13,15,17}
={1,2,3,5,7,9,11,13,17,19}
A intersection B={3,5,7,11,13,17} (common elements)
A-B={2,3,5,7,11,13,17,19}-{1,3,5,7,9,11,13,15,17}
={2,19}
B-A={1,3,5,7,9,11,13,15,17}-{2,3,5,7,11,13,17,19}
={1,9,15}
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