Digitized while satisfying nyquist criterion

A 4 bit analog to digital converter has a voltage range of 0 to 6v and a digitization uncertainty of +/- 1 lsb . What is max uncertainty for 6v signal? what is max uncertainty of for 18 bit  ADC ? Max uncertainty for 30bit ADC? If this ADC has a conversion time of 62 microsec, what is the highest frequency can be accurately digitized while satisfying nyquist criterion?

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