Let's break down the pattern into sections:
1, 3, 5, 7, 9, 11, 13, ..., 99, 101, 103, ..., 999
The first section consists of the single-digit odd integers: 1, 3, 5, 7, 9. Each digit appears once, so the total number of digits in this section is 5.
The second section consists of the two-digit odd integers: 11, 13, ..., 99. There are 45 two-digit odd integers, and each number has two digits, so the total number of digits in this section is 45 * 2 = 90.
Therefore, the first 95 digits of the string come from the first two sections: 5 digits from the single-digit section and 90 digits from the two-digit section.
13579.....99 (total 95 digits) -----
13579.....99 next section takes 3 places so (101...109) adds up 15 places
13579.....99101103105....109
9 is the 110th digit in the sequence
1, 3, 5, 7, 9, 11, 13, ..., 99, 101, 103, ..., 999
The first section consists of the single-digit odd integers: 1, 3, 5, 7, 9. Each digit appears once, so the total number of digits in this section is 5.
The second section consists of the two-digit odd integers: 11, 13, ..., 99. There are 45 two-digit odd integers, and each number has two digits, so the total number of digits in this section is 45 * 2 = 90.
Therefore, the first 95 digits of the string come from the first two sections: 5 digits from the single-digit section and 90 digits from the two-digit section.
13579.....99 (total 95 digits) -----
13579.....99 next section takes 3 places so (101...109) adds up 15 places
13579.....99101103105....109
9 is the 110th digit in the sequence
Statistics : Posted by Nabneet • on 28 Jun 2023, 07:33 • Replies 2 • Views 102