11001, 1001 and 111001 correspond to the 2’s complement representation of which one of the following sets of number? 

(1) 25, 9 and 57 respectively (2) –6, –6 and –6 respectively (3) –7, –7 and –7 respectively (4) –25, –9 and –57 respectively
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 –7, –7 and –7 respectively.

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-7, -7, -7 
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