A = {x : x is divisible by 3, x ∈ N} and B = {x : x is divisible by 9, x ∈ N}
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x:xis a natural number divisible by 3 and 5}′. = {x:xis a natural number that is not divisible by 3 or 5} (vi) {x:xis a perfect square}′={x:x∈Nand x is not ...
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