72.Binary Strings: Start 1 or End 00
★★★combinatoricsCh. 1 — Classical Probability and Combinatorics444+ Problems in Probability
A computer is interpreting an 8-bit binary string, which consists of 8 characters that are either 1 or 0. How many such strings begin with 1 or end with the two characters 00?
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Inclusion–exclusion: .
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