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Prove by cases:
1) Statement: If ð’ âˆˆ â„¤, then ð’
ðŸ + ðŸ‘ð’ + ðŸ“ is an odd integer.
2) Statement: If ð’ âˆˆ â„¤, then ð’
ðŸ‘ âˆ’ ð’ is even.
3) Prove the following statement by Proof by Contrapositive, and Proof by Contradiction:
Statement: If ðŸ”ð’™ âˆ’ ðŸ is odd, then ðŸð’™ + ðŸ‘ is even