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1 . How many bitstings of length 13 start with 010 or end with 11?
(a)
$2^{10} + 2^{11}$
(b)
None of the above.
(c)
$2^{13} - (2^{10} + 2^{11})$
(d)
$3 \cdot 2^{10} - 2^{8}$