Directions: Carry Two Marks Each.
is an independent and identically distributed (i, i, d) random process with Xn equally likely to be +1 or –1. 
is another random process obtained as Yn = Xn + 0.5 Xn – 1. The autocorrelation function of 
is another random process obtained as Yn = Xn + 0.5 Xn – 1. The autocorrelation function of 
denoted by Ry[k] is
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