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jmc

number theory intermediate

Problem

Find the digit past the decimal point in the decimal expansion of .
Solution
First, we find the repeating decimal expansion of 5/14: The digit after the decimal point is the digit in the 6-digit repeating block 5-7-1-4-2-8. Since leaves a remainder of 5, our answer is the digit in the 6-digit block, which is .
Final answer
2