bits and bytes

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Know that:

the bit is the fundamental unit of information

a bit is either 0 or 1

a byte is a group of 8 bits.

Know that the 2 raised to the power of n different values can be represented with n bits.

For example, 3 bits can be configured in 2 x 2 x 2 = 8 different ways.

000 001 010 011

100 101 110 111