Question

If (ξ) = {all the digits in our number system},  A = {x:x is prime},  B = {x:x is a factor of 18}, then find:  (i) (AUB)’    (ii) A’B’    (iii) A-B
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Answer 1

AuB=(2,3,5,7)

AnB=(2,3)

A-B=(5,7)

B-A=( )