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I'll enjoy your kindness to ask this question, despite that it seems it'snt the right destination. Please show me an url, for training in mathematics olympiad competition for 6th Grade: Ages 11–12. Any answers are welcome.

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Here is my proposal. A ticket numbered by 6 digits is called happy if the sum of its even digits equals the sum of the odd ones. To prove the part of the happy tickets is less than 0.1. –  user64494 Oct 12 '13 at 16:15

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Look in The Kvant. Unfortunately, mostly in Russian

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Thank you for your reply, I think it should be simple. –  Zbigniew Oct 15 '13 at 15:37

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