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A processor can support a maximum memory of 4 GB, where the memory is word addressable (a word consists of two bytes). The size of the address bus of the processor is at least _____ bits.

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Correct answer is 31

Memory size = 4GB = 232bytes

Word size = 2 bytes

∴No. of Address bits = Memory size / word size = 232 bytes / 2 bytes = 231 ⇒ 31 bits

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