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Hi friends, Is the positive integer n odd ? 1) n^2 + (n+1) ^

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Hi friends,
Is the positive integer n odd ?
1) n^2 + (n+1) ^2 - (n+2) ^ 2 is even .
2) n^2 - (n+1) ^2 - ( n +2 ) ^ 2 is even .
Please provide explanation. I am not able to solve this one.
DS # OG

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