Question

what percentage of numbers contain the digit 3​

Answer 1

Answer:

Among 10 numbers 0, 1, 2, 3, 4, 5, 6, 7, 8 , 9 written with a single digit, only 1 has digit 3 - the number 3 itself. Among 100 numbers 0, 1, ... ,9, 10, 11, ..., 98, 99 written with 1 or 2 digits, the following include digit 3: 3, 13, 23, 30, 31, ..., 38, 39, 43, 53, ..., 93. 19 numbers in all.

Answer 2

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