[1991]
(a) $1 / 4$
(b) $1 / 2$
(c) $1 / 8$
(d) $1 / 16$
Correct Answer: 3.(d)
Solution: (d) $\frac{N}{N_0}=\left(\frac{1}{2}\right)^{6400 / 1600}=\left(\frac{1}{2}\right)^4=\frac{1}{16}$
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