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Mathematics 11 Online
OpenStudy (anonymous):

How many bit strings are there of length 6 are there that do not contain 1111 as a sub-string?

OpenStudy (kropot72):

I suggest that you find the number of bit strings that do contain 1111as a sub-string. Then subtract that number from the total possible number of 6-bit strings, which is 2^6.

OpenStudy (kropot72):

@StarJ9 Are you there?

OpenStudy (kropot72):

@StarJ9 Here are some 6-bit strings that contain the sub-string 1111. How many more can you find? |dw:1417659425830:dw|

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