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In mathematics an computin, hexadecimal (an aa base 16, or hex) is a poseetional numeral seestem wi a radix, or base, o 16. It uises saxteen distinct seembols, maist eften the sembols 09 tae represent values zero tae nine, an A, B, C, D, E, F (or alternatively a, b, c, d, e, f) tae represent values ten tae fifteen.