Which of the following values cannot be stored accurately using a floating-point format in which the most significant bit is the sign bit, the next three bits represent the exponent field in excess notation, and the last four bits represent the mantissa?
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Answer: D) 6 1/4
6 1/4 = 110.01 in binary, which needs 5 mantissa bits after normalizing. The format has only 4 mantissa bits, so it cannot be stored exactly.
Source: Scan #58 page 1 Q11