Q.

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
Answer» 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.
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