The term binary means based on two numbers only. It would be possible to use any two numbers for a binary system, however, since 0 and 1 are the first two numerals, it was considered reasonable to use those. It could just as easily have been 1 and 2. The advantage of a binary system is that it is easily converted to an electrical circuit state; one number means on, the other number means off. That makes it useful for computers, which are based on electrical circuits.
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The only numbers used in binary are 0 and 1
The only two numbers that represent a binary digit are 0 and 1
0 and 1.
To add the binary numbers 11011 and 1101, we start by aligning the numbers vertically and then adding each column from right to left. 1 + 1 = 10 in binary (0, carry 1), 1 + 0 = 1, 0 + 1 = 1, 1 + 1 = 10 (0, carry 1), and finally 1 + 1 = 10 (0, carry 1). Therefore, the sum of 11011 and 1101 in binary is 101000.
As per the 8421 rule the given binary number can be solved as : 0 0 0 0 0 1 1 1 0 0 0 0 0 4 2 1 i.e : 4+2+1 = 7 So the answer is 07 in decimal for 00000111 in binary