15 in the hexadecimal number system is represented by 21 in the decimal system.
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The answer is 15.
15
15 base 10 equals F base 16
The number 249 in hexadecimal would be F9. The digits in base 16 correspond to powers of 16 rather than 10. For a two-digit number, the place values are 16 and 1, and the usable values are from 0 to 15, with values 10 through 15 represented by letters A (10) through F (15). F9 = (15x16) + (9x1) = 240 + 9
ABCDEF IS a number - in hexadecimal form. In decimal form it is equivalent to 10*16^5 + 11*16^4 + 12*16^3 + 13*16^2 + 14*16 + 15 = 11259375.