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{Xn}n=−∞n=∞ is an independent and identically distributed (i.i.d.) random process with Xn equally likely to be +1 or −1. {Yn}n=−∞n=∞ is another random process obtained as Yn = Xn + 0.5 Xn−1. The autocorrelation function of {Yn}n=−∞n=∞, denoted by RY[k], is
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Correct : b
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