2's complement is necessary for converting all decimal numbers into binary 

Convert the binary number 1010₂ to decimal number (you can simply mention the decimal number without the subscript).

The total number of possibilities of binary numbers possible 3 bits are used is:

Apply 2's complement to the result of the following binary operation, and provide the end result: 00₂ + 01₂ (Just provide the final binary result without any subscript). 

Explanation of the question: Add the binary numbers, apply the 2's to its result and provide the result.

Identify the logic gate which adds the inputs applied to it.