Binary is a series of eight numbers, all comprising of the number 0, or the number 1.
Each 0 or 1 in the sequence stands for a particular number, set out like so:
128 64 32 16 8 4 2 1
0 0 0 0 0 0 0 1 = 1, and so forth.
So eight would be 00001000.
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I do not believe that is a valid binary number. All binary numbers must be divisible by 8
In a simple way, write down the numbers from right to left: 1,2,4,8,16,32,64 and 128. Binary one is 000001. (write this above or below the other numbers I just gave you) The number two is 000010 in binary. Three is 000011. Four is 000100. Five is 000101. You should see the pattern. The Binary number corresponds to the placement of ones and zeros to 128 64 32 16 8 4 2 1.
The sum of binary numbers is also a binary number.
Write a subscript 2 after the numbers or, as in the question, simply say so.
vivek