Question

Recall when you built your binary message sending device. Why did we decide to send a message as a sequence of states (A and B) rather than modifying our devices to represent more states (State C, State D, State E, ...)

Answer 1

it is assumed that only A and B can be used, for the reason that in binary there are only two Variables.

Step-by-step explanation:

In number bases digits include are from 0 to base-1, e.g. in base two (binary), we have from 0 to 2-1. that means we only have 0 and 1. there's no other digit or variable allowed apart from 0 and 1 in base 2 (binary). so in the binary message sending device, a message can only be sent as a sequence of states (A and B).