How many 14 bit strings that is bit strings of length 14 are

Last updated: 4/25/2023

How many 14 bit strings that is bit strings of length 14 are there which a Start with the sub string 011 b Have weight 7 i e contain exactly 7 1 s and start with the sub string 011 c Either start with 011 or end with 01 or both d Have weight 7 and either start with 011 or end with 01 or both