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A hexadecimal colour code is a six-digit code where the code for any particular colour the RGB values, each represented by a 2-digit code as follows:the first two digits represent the hexadecimal code for the red colour type,the second two digits represent the hexadecimal code for the green colour type, andthe third two digits represent the hexadecimal code for the blue colour type.In each case, these codes include leading zeros, so that they are two digit codes in the range [00, FF]. This allows 256 different values for each colour type making 16,777,216 colours in all.
These are used quite often to represent values stored in bytes - 1 byte is represented as two hexadecimal digits. For example, both the MAC address of a network card and the new IP addresses (IPv6) are usually shown as hexadecimal.
The different digits have different values.
With 6 binary digits, you have 26 different possibilities. This is because there are two possibilities for each digit, and each digit is independent of the other digits - so you just multiply the possibilities for each digit together.
The two sets of digits have different place values.