Consider a string of length 7 consisting of 0's, 1's and 2's. For example, 0121210 is such a string. (a) How many possible such strings are there? (b) How many such strings start with 22? (c) How many such strings start and end with 00?

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Chapter8: Sequences, Series,and Probability
Section8.6: Counting Principles
Problem 10ECP: In Example 10, the team must consist of six boys and six girls. How many different 12-member teams...
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Consider a string of length 7 consisting of 0's, 1's and 2's. For example, 0121210 is such a string.

(a) How many possible such strings are there? 

(b) How many such strings start with 22?   

(c) How many such strings start and end with 00?

 

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