SolHW10f07

# SolHW10f07 - HW10F07 CS336 Page 458 23 24 29 Page 471 4a 4d...

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HW10F07 CS336 Page 458: 23, 24, 29 Page 471: 4a, 4d, 4f Page 542: 1a, 23, 24, 25 Page 458: 23a. Notice that the number of bit strings of length n that contain a pair of consecutive 0s is the sum of the following: The number of such strings of length n ending with 1. These strings are precisely such strings of length n - 1 with 1 added in the end. So the number of such strings is a n - 1 . The number of such strings of length n ending with 10. These strings are precisely such strings of length n - 2 with 10 added in the end. So the number of such strings is a n - 2 . The number of such strings of length n ending with 00, which is 2 n - 2 because we can have anything in the ﬁrst n - 2 positions. So the recurrence relation for the number of such bit strings is a n = a n - 1 + a n - 2 + 2 n - 2 , for n 2 23b. The initial conditions are a 0 = 0 and a 1 = 0, since strings of length 0 or 1 cannot contain a pair of consecutive 0s. 23c.

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## This note was uploaded on 09/20/2008 for the course CS 336 taught by Professor Myers during the Spring '08 term at University of Texas.

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SolHW10f07 - HW10F07 CS336 Page 458 23 24 29 Page 471 4a 4d...

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