Question 28
Answer-format rule: round a non-integer answer to the nearest integer. If the calculated answer has more than five digits, give its last five digits.
Writing 1, 2, 3, …, 20 uses the digit 1 twelve times, counting both appearances in 11. How many times is the digit 5 written when writing every integer from 1 to 231?
Writing 1, 2, 3, …, 20 uses the digit 1 twelve times, counting both appearances in 11. How many times is the digit 5 written when writing every integer from 1 to 231?