Must show all the steps with full reasoning and with correct answer, please. 13. Jonah's favourite number is a positive integer. One day, he decided to write down all of thepositive 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?

According to the given data Jonah's favourite number is positive integer. One day he write down all…

Answered: 13. Jonah's favourite number is a…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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13. 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?