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  • ...visible by <math>3</math>. These numbers are <math>15, 45, 135, 345, 1245, 12345</math>, or <math>\boxed{\textbf{(C)} ~6}</math> numbers. <b>Case 5:</b> <math>5</math> digits. We have only <math>12345</math>, so <math>1</math> number.
    5 KB (764 words) - 19:07, 11 November 2023