(a) A bit string is a finite sequence of O's and l's. How many bit strings have length 7? bit strings (b) How many bit strings of length 7 begin with four O's? If a bit string of length 7 begins with four O's, then positions remain to be filled in. Since each of these positions can be filled with either a 0 or a 1, the number of bit string of length 7 that begin with four O's is (c) How many bit strings of length 7 begin and end with a 1? bit strings

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