Yes. In the case of integers, to get the two's complement, first take the one's complement, then add one.
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No, binary numbers don't consist of ones and twos, they are ones and zeros.
3 ones
20, that's one 16, no eights, one four, no twos and no ones.
it describes itself. 1 zero, 2 ones, 3 twos, and 2 threes
By ones By twos By fours By eights By tens By twenties By fourty (if you want to count that one)