The 2's complement of a binary number is found in two steps.
First, we invert the bits of the original binary number, meaning turn all 1s to 0s and vice versa. With the binary number 110110, the result of inverting the bits will give us 001001.
Second, we add 1 to the inverted binary number. Thus, adding 1 to 001001 gives us the sum 001010.
Thus, the 2's complement of binary 110110 is 001010. It's important to note that the 2's complement representation is often used in computer programming to handle negative numbers.