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Bias formula for floating point representation is 2^k-1

bias formula for IEEE floating point representation is 2^(k-1)-1   Is it right????
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bias = (2^(k-1)) -1

Thats how we calculate bias
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but when at some places where IEEE is not mentioned then first formula is used .....but at some place latter one is used?
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@  yes correct 

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we do not use 2^(k-1) as bias in IEEE representation due to some exception as in IEEE we have some special values when Exponent=255 so if u will use 128 as bias then we can get exponent upto 127+128= 255 which is already reserved for some special values hence we use 2^(k-1) - 1
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