421 is an integer - NOT a fraction. Even if the number had been 0.421, the answer would have depended on what string was repeating. The question would not have made clear whether the recurring fraction was meant to be 0.421421421... or 0.4212121... or 0.42111...
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421 is an integer and there is no sensible way to express it as a fraction.
fraction of 4.21 = 421/100
what is 0.194 as a repeating fraction
If you mean: 0.151515.....repeating then as a fraction it is 5/33
0.13333333 repeating in fraction = 12/90 or 2/15