A byte is a combination of:

A byte is a combination of:

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Explanation
A byte is a combination of 2 nibbles, as each nibble consists of 4 bits, and 4 bits + 4 bits = 8 bits, which equals one byte. 

Bit: The smallest unit of data in computing, representing a single binary value (0 or 1). 
Nibble: A group of 4 bits. 
Byte: A group of 8 bits, which is typically the smallest addressable unit of memory in most computer systems.