How many 11-bit strings (that is, bit strings of length 11) are there which: a. Start...

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How many 11-bit strings (that is, bit strings of length 11) are there which: a. Start with the sub-string 011? # b. Have weight 4 (i.e., contain exactly 4 1's) and start with the sub-string 011? c. Either start with 011 or end with 01 (or both)? d. Have weight 4 and either start with 011 or end with 01 (or both)? How many 11-bit strings (that is, bit strings of length 11) are there which: a. Start with the sub-string 011? # b. Have weight 4 (i.e., contain exactly 4 1's) and start with the sub-string 011? c. Either start with 011 or end with 01 (or both)? d. Have weight 4 and either start with 011 or end with 01 (or both)?