Question

Compute d[n]d[n-1] + d[n-1]d[n-2] for n = 0, 1, 2.

(a) 0, 1, 2

(b) 0, 0, 1

(c) 1, 0, 0

(d) 0, 0, 0

This question was posed to me in an online interview.

My enquiry is from Useful Signals topic in section Signals and Systems Basics of Signals and Systems

Answer 1

The correct option is (d) 0, 0, 0

Explanation: Only one of the values can be one at a time, others will be forced to zero, due to the delta function.