• anonymous
Another very easy problem, Apoor, a four year old child, had to write $$1$$ to $$n$$ numbers as a punishment. If he had made a mistake while writing any number, say $$r$$, then he had to write that number again $$(r-1)$$ times, which he always wrote correctly. If he had made mistakes while writing all except one number and the total numbers he wrote is $$111$$, then find the number that he wrote correctly.
Mathematics

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