The answer depends on the repeating string and also on other digits after the decimal point before the repeating string starts.
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17 is already in decimal. If you mean 1/7 (the fraction) then it's 0.142857, and the 142857 in the fraction part repeats forever.
If the 7 repeats forever, it's 7/9 .
It is not possible to have a terminating decimal which repeats or a repeating decimal which terminates. The two types are mutually exclusive.
A fraction that repeats continuously without stopping is called a recurring fraction. 0.1 recurring, or 0.111111... is equal to 1/9, or one ninth.A fraction with a prime denominator other than 2 or 5, always produces a recurring decimal.
If it repeats, there should be a little line over the last digit(s) that repeat. If it terminates, then the numbers will not repeat.