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A binary number is simply a way of representing a number in such a way that the place value of each digit is two times that of the digit to its right.Similarly, a decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.
Each binary digit represents 2 times that of the digit to its right. So for example: 10b = 2d 100b = 4d 1010b = 8d + 2d = 10d
Binary numbers particularly in computing tend to be 8 digit. 00000000 = 0 00000010 = 2 00000100 = 4 00001000 = 8 00010000 = 16 00100000 = 32 01000000 = 64 10000000 =128
It is the same number: 1. Binary numbers are base-2, with each digit place corresponding to an exponent of 2 rather than 10 in the decimal number system. So that the number 11, which in decimal means 10 + 1, would represent 2 + 1 (3) in the binary system, which can only have the value 0 or 1 in each digit place.
There is basically one way to write hexadecimal numbers. Of course, the numbers represent information, and this information can be represented in may other ways; some of them are in binary (4 binary digits for each hexadecimal digit), in decimal, or each byte as as decimal number (as in the dotted decimal notation used for IP version 4 numbers).