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range of normalised mantissa

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sign bit ( 1 bit)

biased exponent ( 6 bits)

mantissa( 20 bits)

what is the range of normalised mantissa?

answer : 1 to 2 - 2-20

minumum is 1

but max how is 2-2-20.....they havent considered exponent to be all 1's

shouldnt it be 2-2-20 * 231

where 231 is obtained by all 1's in exponent part

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