Higher CS - Integers (Revision)

Data representation
Integers

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How would the number -90 be represented in binary?

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How would the number -11 be represented in binary?

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Which denary number is represented by the following twos complement binary number?

11001101

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Which denary number is represented by the following twos complement binary number?

11111100

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What is the range of negative and positive numbers which can be represented with 4 bits?