1. What is the following type of system called? y[n] = x[n] + y[n-1]. a) Subtractor system b) Adder system c) Product System d) Divisor System AnswerAnswer: b [Reason:] If we write for n-1, n-2, .. we will obtain y[n] = x[n] + x[n-1] + x[n-2] …, thus obtaining an adder system. 2. Which of…