Homework 4

Reminder: Late homeworks will NOT be accepted!

1. Rosen, Section 3.1, 3
2. Rosen, Section 3.1, 4
3. Prove that the product of an odd integer and an even integer is even. Write your proof out twice, once in tabular form and once in sentence form.
4. Prove that the sum of any three consecutive integers is divisible by 3. Write your proof in either tabular or sentence form.

   Write all remaining proofs in sentence form.

5. Rosen, Section 3.1, 22.
6. Rosen, Section 3.1, 31.

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