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Can anyone prove the following?

given n numbers [integer and not necessary distinct] and lets denote the sum of all those number by Sum(n) then we have one of the following facts:

1- Sum(n) is Divisible By n.

2- if Sum(n) is not Divisible By n then [Sum(n) - x] is Surely Divisible By n where x is one of those given numbers.

example: given 1 , 2 , 3 there sum is 6 then 6 is divisible by 3

another example 1 , 2 , 3 , 4 there sum is 10 not divisible by 4 but if we take 10 - 2 yield 8 that's divisible by 4

anyone can help me to prove this?

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  • $\begingroup$ Welcome to MSE! Could you please let us know what you have tried so far? As you are new here, I just want to let you know that these "I demand my proof"-questions are highly frowned upon. $\endgroup$ – Diglett Oct 18 '18 at 1:30
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This does not always hold. If we have $1,1,3$ the sum $5$ is not divisible by $3$, but neither are $5-1=4$ and $5-3=2$.

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