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1 . What is the number of bitstrings of length $n$ that contain 00 or 11?

(a)

$2^n - 4$

(b)

$2^n - 2$

(c)

$2 \cdot n \cdot 2^{n-1}$

(d)

$2 \cdot (n-1) \cdot 2^{n-2}$