Infinite Serieshard
0:00.0
Let be the sum of the reciprocals of all positive integers that do not contain the digit '9' in their decimal representation (known as the Kempner series). Which of the following statements is true?
Let be the sum of the reciprocals of all positive integers that do not contain the digit '9' in their decimal representation (known as the Kempner series). Which of the following statements is true?