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The thing is that there is a question which needs me to prove something. I have done it already but the thing that troubles me is that it wants me to prove this:

[tex]a_{1}+a_{2}+a_{3}+.................a_{K}>K[/tex]

[tex]a_{i}[/tex] is a positive integer.

I know this is always true. but how should I prove it mathematically?

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# Mathematical proof

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