Prove that for any integer n, at least one of the integers n, n+2, n+4 is divisible by 3 .
Stacey Warren - Expert brainly.com
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I don't recall how to organize a proof of this type.
But you might take it one case at a time...
If n is divisible by 3, then you're done.
If n is not divisible by 3, then it must either be 1 greater or 2 greater than a number that is divisible by 3 (i.e., if it was 3 greater than a number divisible by 3, it would also be divisible by 3).
If n is one greater, then n + 2 is three greater than the number divisible by 3, therefore n+2 is also divisible by 3.
If n is two greater than a number divisible by 3, then n + 4 will make it 6 greater than that number, making n + 4 divisible by 3.
That's not a proof, but maybe you could use that logic to formalize in a proof format.