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.
F. Numbers in hecadecimal start 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10, 11, 12, ...
The answer is 15.
15
111111 in binary is 255 in decimal which is FF in hexadecimal (i.e. 15 units and 15 16s)
The hexadecimal system requires 15 symbols. 0-9 provide 10, so 5 more, different symbols are needed: hence A to E. They could equally well have been £,%,t,# and ].
255
Hexadecimal is a number system whoose base has 16 numbers. Hexadecimal is usually represented as 0 through 9 and A through F. An example of counting from 9 to 33 follows. 9 A B C D E F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21
15 base 10 equals F base 16
Mnemonics is a method of remembering things by associascation. Hexadecimal is a number system. 0-9 are as usual and then a(10) b(11) c(12) d(13) e(14) f(15)
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
A digit in math is a component of a natural number which is less than the base of the number system you are using. Natural numbers are all of the non-negative integers, sometimes including zero. So in the decimal number system, which has a base of 10, a digit is any number from 0 to 9. If you are using the binary number system, which has a base of 2, a digit can only be a 0 or a 1. If you are using the hexadecimal number system, which has a base of 16, a digit is any number from 0 to 15 (the numbers 10-15 are generally represented as A, B, C, D, E, F). If you are using the Sexagesimal number system, which has a base of 60, a digit is any number from 0 to 59. This is the number system which the Babylonians used, which is one of the reasons why we divide an hour into 60 minutes, and a minute into 60 seconds. This is also why we have 360 degrees to a circle.
It is -F.