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discrete maths problem-counting

 
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Feb5-05, 03:35 AM   #1
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discrete maths problem-counting

how many bit strings of length 8 contain either three consecutive 0s or four consecutive 1s?
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Feb5-05, 03:47 AM   #2
 
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As ever inclusion-exclusion: the number with 3 consecutive 0s plus the number with 4 consecutive 1s over counts by how many?
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