Prove for all N in Z, if N is odd if and only if N+2 is odd
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Originally Posted by sderosa518 Prove for all N in Z, if N is odd if and only if N+2 is odd The "if" part: express N in the form 2k+1 and show that this makes N+2 in the same form. The "only if" part: express N+2 in the form 2k+1 and show that this makes N in the same form.
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