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number theory intermediate

Problem

What is the th digit after the decimal point when is expressed as a decimal?
Solution
Using long division, we find that can be expressed as a repeating decimal .

After the first digit, there is a three-digit repeating block. We want to find the th digit after the first digit. The remainder when is divided by is . Therefore, the th digit is the second digit in the repeating block, which is .
Final answer
9