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1 . How many bitstings of length 13 start with 010 or end with 11?

(a)

$3 \cdot 2^{10} - 2^{8}$

(b)

$2^{10} + 2^{11}$

(c)

None of the above.

(d)

$2^{13} - (2^{10} + 2^{11})$