how many 11 - strings (that is, bit strings of length 11) are there which: a. start with sub - string 011 b. have weight 8 (i.e contain exactly  8 1's ) and start with the sub - string 011 c. either start with 011 or end with 01 (or both) d. have weight 8 and either start with 011 or end with 01 (or both)

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