Question

Why does binary addition have a rule for 1 + 1 + 1 if only two numbers

are being added together?

Answer 1

See below

Step-by-step explanation:

Because sometimes you have to 'carry' a 1 over to the ext column when adding two binary numbers

Example :

1 1 1

+1 1 1 <==== starting in the first R column add 1 + 1 to get 0 and carry 1

then the next column you will add 1 + 1 + 1 = 1 and carry 1 again

then 1 + 1 + 1= 1 and carry 1 again (to column 4) to get

1 1 1 0