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Mathematics, 08.06.2021 17:30 taylorwhitfield6

Jonah's favourite number is a positive integer. One day, he decided to write down all of the positive integers starting at 1 and ending with his favourite number. He noticed, in doing so, that he wrote the digit 7 exactly 30 times. What is Jonah's favourite number?

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Jonah's favourite number is a positive integer. One day, he decided to write down all of the positiv...

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