### A good answer might be:

Might be minus one.

# Patterns that Add to Zero

Minus one added to plus one gives zero. So if a particular bit pattern results in the pattern that represents zero when added to one, it can represent minus one.

>       11111 111
>        0000 0001  =   110
>        1111 1111  =   -1
>        ---------      -----
>        0000 0000  =   010

There is a carry out of one from the high order column, but that is fine in this situation. The "binary addition algorithm" correctly applied gives the correct result in the eight bits. Look at another interesting case:

>       11111 11
>        0000 1110  =   1410
>        1111 0010  =   ?
>        ---------      -----
>        0000 0000  =   010

### QUESTION 15:

A number added to 1410 results in a zero. What could that number be?