Question

what is 1st complement 2nd complement number in binary number system​

Answer 1

1's complement of a binary number is another binary number obtained by toggling all bits in it, i.e., transforming the 0 bit to 1 and the 1 bit to 0. 2's complement of a binary number is 1 added to the 1's complement of the binary number. These representations are used for signed numbers.

Answer 2

1's complement of a binary number is another binary number obtained by toggling all bits in it, i.e., transforming the 0 bit to 1 and the 1 bit to 0. 2's complement of a binary number is 1 added to the 1's complement of the binary number. These representations are used for signed numbers.