For every two sets A and B, (AUB)-B=A. There exists an even integer, the sum of whose digits is odd, and the product of whose digits is even. There exist odd integers x and y such that 71 x²+3y²

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ISBN:9780470458365
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Give formal well-written proofs when you are proving a result or a counter example otherwise.

4.
For every two sets A and B, (AUB) – B = A .
There exists an even integer, the sum of whose digits is odd, and the product of whose
digits is even.
5.
6.
There exist odd integers x and y such that 7 1 x² +3y²
Transcribed Image Text:4. For every two sets A and B, (AUB) – B = A . There exists an even integer, the sum of whose digits is odd, and the product of whose digits is even. 5. 6. There exist odd integers x and y such that 7 1 x² +3y²
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