Mathematics, 08.12.2019 07:31, chickennuggets0621

Prove that given any 17 integers, there exist nine of them whose sum is divisible by 9.

(it might to use the fact that given any five integer you can find three whose sum is divisible by 3)

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Prove that given any 17 integers, there exist nine of them whose sum is divisible by 9.

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