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Question: can you guys help understand how to do these questions...

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Can you guys help understand how to do these questions?

1. Let [0,00). For r E I define a) Determine Ua, and A, reI rel b) Determine UB, andB, TET rEl ) Determine UC, andC, rEl rEl 2. Prove that if a is any odd integer and b is any even integer, then 2a +3b is even 3. Prove that for all a, b.c,d e Z,falb and cld, then acl bd 4. Suppose x,y Z. Ifx and y are odd, then.xy is odd. 5. Suppose a is an integer. It 512a, then 5la.
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