3. A machine stores floating point numbers in 7-bit word. The first bit is used for the sign of the number, the next three for the biased exponent and the next three for the magnitude of the mantissa. What is the number (0010110)2 represented in base-10?

A computer "nibble" consists of four "bits," each bit being either a 0 or a 1. If characters are represented using a code that uses a nibble for each character, how many different characters can be represented?

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