The same number of bits are used to represent 1's complement and 2's complement. To take 2's complement, first take the 1's complement, then add 1 to the result.
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9's complement of a decimal number represented in 2421 code is easily obtained by replacing the 1s with 0s,and 0s with 1s,so 2421 code is called a self complementing code.example-2421 of '2' is '0010',after replacing the 0s with 1s and 1s with 0s weget '1101' which is the 2421 of '7'(9s complement of 2 is 7). Thus 2421 code is self complementary.
Because 57 is bigger then 33
Complement = 90 degrees.
Sure. The complement is -8° .
Since the sum of the two complement angles is 90⁰ , then the complement of a 60⁰ angle is a 30⁰ angle.