Question: Q2 10 Points Let a, b E Z. Prove that 3ab + 5 is odd if and only if a or b is even. Please

Q2 10 Points Let a, b E Z. Prove that 3ab + 5 is
Q2 10 Points Let a, b E Z. Prove that 3ab + 5 is odd if and only if a or b is even. Please select file(s) Select file(S) Q3 10 Points Prove that for all sets A, B, C, if A, B C C, then A - B = An (C - B). Please select file(s) Select file(s) Q4 18 Points Define a relation R on Z by x Ry if and only if 3x | y. Q4.1 3 Points Provide an example of a pair x, y E Z such that x Ry. (That is, (x, y) ( R.)

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