Question: Prove the following statements using either direct proof, contrapositive proof, proof by contradiction, or proof by cases. State clearly which method you are using. Do

Prove the following statements using either direct proof, contrapositive proof, proof

Prove the following statements using either direct proof, contrapositive proof, proof by contradiction, or proof by cases. State clearly which method you are using. Do NOT use mathematical induction! (a) (2 points) Vn E N. 1+(-1)" (2n 1) is a multiple of 4

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